TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A

PJB
Highlights & Features
Universal AC Input voltage range
Up to 93.5% efficiency
Power Boost of 200% for 10 seconds
High PF up to 0.99 and conforms to harmonic current
IEC/EN 61000-3-2, Class A
Conformal coating on PCBA to protect against common
dust and chemical pollutants
Versatile configuration options: Open Frame,
L Frame, Enclosed
Remote ON/OFF option for selected models

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Safety Standards

CB Certified for worldwide use / PSE Compliance

Model Number:
Unit Weight:
Dimensions(L x W x D):

PJB-24V300W☐☐A
Open Frame
L FrameEnclosed
0.64 kg (1.41 lb)
0.95 kg (2.09 lb)
1.05 kg (2.31 lb)
222 x 95 x 53.6 mm
252 x 108 x 65.4 mm
252 x 108 x 66 mm(8.74 x 3.74 x 2.11 inch) (9.92 x 4.25 x 2.57 inch) (9.92 x 4.25 x 2.6 inch)

General Description
The Open frame power supply PJB-24V300W☐☐A comes with universal AC input at 85Vac to 264Vac. Other features include low
leakage / Inrush current and conformal coating on the PCBAs to provide protection against dust and chemical pollutants. The built-in
active PFC provides PF > 0.97 and fulfills Harmonic Current Emission according to IEC/EN 61000-3-2. The feature built-in Power Boostof 200% for 10 seconds enables reserve power to be always available for reliable startup of loads with high inrush current, thus eliminating
the need of a more expensive power supply unit at higher power rating. Metal chassis and case cover are available as options for different
installation preferences.
The product is certified for EMI standards according to EN 55032 and EMS according to IEC 61000-6-1. The products conform to majorinternational safety standards according to IEC 60950-1/62368-1 standards and are fully compliant with RoHS Directive 2011/65/EU forenvironmental protection.

Model InformationPJB Open Frame Power Supply
Model Number

Input Voltage Range

Rated Output Voltage

Rated Output Current

PJB-24V300W☐☐A

85-264Vac

24Vdc

12.5A

Model Numbering
CC Code
PJ

B–

24V

Open Frame

Product TypeB – Power Boost
Series

Output Voltage Output Power

1

300W

A

□

□

Package TypeB – Open Frame
L – L Frame
C – Enclosed

Remote ON/OFF Function Connector TypeA – JSTN – No Remote ON/OFF
R – With Remote ON/OFF

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Specifications
Input Ratings / Characteristics
Nominal Input Voltage

100-240Vac

Input Voltage Range

85-264Vac

Nominal Input Frequency

50-60Hz

Input Frequency Range

47-63Hz

Input Current

4.1A typ. @ 100Vac, 2.0A typ. @ 200Vac

Efficiency at 100% Load

91% typ. @ 100Vac, 93.5% typ. @ 200Vac

Max Inrush Current (Cold Start)

15A typ. @ 100Vac, 30A typ. @ 200Vac

Power Factor at 100% Load

0.99 typ. @ 100Vac, 0.95 typ. @ 200Vac

Leakage Current

0.2mA @ 100Vac, 0.4mA @ 200Vac

Output Ratings / Characteristics*1
Nominal Output Voltage

24Vdc

Factory Set Point Tolerance

24Vdc ± 2% @ No load

Output Voltage Adjustment Range

21.6-26.4Vdc

Output Current

Line Regulation

12.5A (continuously operating at 24V)
25A (Power Boost for 10 seconds at 24V, refer to the details in the
Functions section)
300W (continuously operating at 24V)
600W (Power Boost for 10 seconds at 24V, refer to the details in
the Functions section)< 96mV

Load Regulation< 150mV

PARD*2 (20MHz)< 150mVpp @ > 0°C to 50°C
< 180mVpp @ -10°C to 0°C

Start-up Time

500ms typ. @ 100Vac & 200Vac (100% load)

Hold-up Time

20ms typ. @ 100Vac & 200Vac (100% load)

Dynamic Response (Overshoot & Undershoot O/P Voltage)± 5% @ 0-50% load and 50-100% load
(Slew Rate: 0.1A/μS, 50% duty cycle @ 100Hz & 1KHz)

Start-up with Capacitive Loads

8,000µF Max

Output Power*1 For power de-rating from 50°C to 70°C, see power de-rating on page 3.
*2 PARD is measured with an AC coupling mode, 150mm wires, and in parallel end terminal with 0.1μF capacitor (C1) & 22μF electrolytic capacitor (C2).

2

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
MechanicalCase Cover / Chassis
Dimensions

Unit Weight

SGCC
Open Frame

222 x 95 x 53.6 mm (8.74 x 3.74 x 2.11 inch)

L Frame252 x 108 x 65.4 mm (9.92 x 4.25 x 2.57 inch)

Enclosed

252 x 108 x 66 mm (9.92 x 4.25 x 2.6 inch)

Open Frame

0.64 kg (1.41 lb)

L Frame0.95 kg (2.09 lb)

Enclosed

1.05 kg (2.31 lb)

Indicator

NA

Cooling System
Terminal

Convection / Forced Cooling
Input

JST B3P5-VH (LF)(SN)

Output (-)
Output (+)

JST B7P-VH (LF)(SN),JST B6P-VH (LF)(SN)Wire

AWG 22-16

Noise (1 Meter from power supply)Sound Pressure Level (SPL) < 25dBA

Environment
Surrounding Air TemperaturePower De-rating

Operating-10°C to +70°C

Storage-25°C to +85°C

Temperature(Mounting Orientation A)

Convection
Open Frame / L Frame: > 50°C de-rate power by 2% / °C
Enclosed: > 40°C de-rate power by 2% / °C
Forced CoolingOpen Frame / L Frame: > 60°C de-rate power by 2% / °C
Enclosed: > 50°C de-rate power by 2% / °C
(For other mounting orientations, please see pages 11-12)

Input Voltage< 90Vac de-rate power by 2% / V

Operating Humidity

5 to 95% RH (Non-Condensing)Operating Altitude

0 to 5,000 Meters (16,400 ft.)

Shock Test (Non-Operating)

IEC 60068-2-27, Half Sine Wave: 50G for a duration of 11ms,
3 shocks for each 3 directions

Vibration (Operating)

IEC 60068-2-6, Sine Wave: 10Hz to 55Hz @ 19.6m/S² (2G peak);
10 min per cycle, 60 min per axis for all
X, Y, Z direction

Pollution Degree

2Protections
Overvoltage

27.6-33.6V, Latch Mode

Overload / Overcurrent> 201% of rated load current, Hiccup Mode,
Non-Latching (Auto-Recovery)

Over Temperature

Latch Mode

Short Circuit

Hiccup Mode, Non-Latching(Auto-Recovery when the fault is removed)

Internal Fuse

T10AH

Protection Against ShockClass I with PE*3 connection*3 PE: Primary Earth3

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Reliability DataMTBF

JEITA RCR-9102B

Expected Cap Life Time

> 200,000 hrs.
10 years (100Vac, 50% load @ 40°C)

Safety Standards / Directives
Safety Entry Low Voltage
Electrical Safety

SELV (EN 60950-1)
CB scheme
TUV Bauart
cTUVus
CCC

CE

IEC 60950-1 / IEC 62368-1
EN 60950-1 / EN 62368-1
UL 62368-1 and CSA C22.2 No. 62368-1
GB4943
Design to meet DENAN at 100Vac - 240Vac
In conformance with EMC Directive 2014/30/EU and Low Voltage
Directive 2014/35/EU

Galvanic Isolation

Input to Output

3.0KVac

Input to Ground

2.0KVacOutput to Ground

0.5KVac

EMC
Emissions (CE & RE)

CISPR 32, EN 55032, FCC Title 47: Class B

Immunity

Generic Standards: EN 55035; Design to meet IEC 61000-6-2

Electrostatic Discharge

IEC 61000-4-2

Level 4 Criteria A1)
Air Discharge: 15kV
Contact Discharge: 8kV

Radiated Field

IEC 61000-4-3

Level 3 Criteria A1)
80MHz-1GHz, 10V/M with 1kHz tone / 80% modulation

Electrical Fast Transient / Burst

IEC 61000-4-4

Level 4 Criteria A1)
4kV

Surge

IEC 61000-4-5

Conducted

IEC 61000-4-6

Level 4 Criteria A1)
Common Mode3): 4kV
Differential Mode4): 2kV
Level 3 Criteria A1)
150kHz-80MHz, 10Vrms

Power Frequency Magnetic
FieldsIEC 61000-4-8

Level 4 Criteria A1)
Magnetic field strength 30A/Meter

Voltage Dips and Interruptions

IEC 61000-4-11

Harmonic Current Emission

0% of 100Vac
20ms, 5000ms
Criteria B2)
40% of 100Vac
200ms
Criteria B2)
Criteria B2)
70% of 100Vac
500ms
Criteria B2)
0% of 200Vac
20ms, 5000ms
Criteria B2)
40% of 200Vac
200ms
70% of 200Vac
500ms
Criteria B2)
IEC/EN 61000-3-2, Class A and Class D (@100% Load)

Voltage Fluctuation and Flicker

IEC/EN 61000-3-3

Voltage Sag Immunity
SEMI F47 – 0706

80% of 200Vac
70% of 200Vac
50% of 200Vac

160Vac, 1000ms
140Vac, 500ms
100Vac, 200ms

1) Criteria A: Normal performance within the specification limits
2) Criteria B: Temporary degradation or loss of function which is self-recoverable
3) Asymmetrical: Common mode (Line to earth)4) Symmetrical: Differential mode (Line to line)4

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

Criteria A1)
Criteria A1)
Criteria A1)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Block Diagram

5

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Dimensions
PJB-24V300WB☐A (Open Frame)
L x W x D: 222 x 95 x 53.6 mm (8.74 x 3.74 x 2.11 inch)

Item Device Description

6

1

Input Connector (CN1)2

Output Connector (CN2, CN3)

3

VR

4

Remote ON/OFF (JST B2B-XH-A)

Notes
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Dimensions are in mm [inch]
For information on Mounting Torque, and I/O Connector and Housing, please referto the Instruction Manual.

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
PJB-24V300WL☐A (L Frame)
L x W x D: 252 x 108 x 65.4 mm (9.92 x 4.25 x 2.57 inch)

Item Device Description

7

1

Input Connector (CN1)2

Output Connector (CN2, CN3)

3

VR

4

Remote ON/OFF (JST B2B-XH-A)

5

Chassis

Notes
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Dimensions are in mm [inch]
For information on Mounting Torque, and I/O Connector and Housing, please referto the Instruction Manual.
For L Frame type: There are 6 threaded mounting holes and 5 normal mounting
holes.

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
PJB-24V300WC☐A (Enclosed)
L x W x D: 252 x 108 x 66 mm (9.92 x 4.25 x 2.6 inch)

Item Device Description

81

Input Connector (CN1)2

Output Connector (CN2, CN3)

3

VR

4

Remote ON/OFF (JST B2B-XH-A)

5

Chassis

6

Cover

Notes
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Dimensions are in mm [inch]
For information on Mounting Torque, and I/O Connector and Housing, please referto the Instruction Manual.
For Open Frame type: There are 4 normal mounting holes

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Assembly & Installation
Assembly Reference■ Open Frame■ L Frame / Enclosed

For safety reasons, please ensure the mounted device is kept at ≥ 4mm (0.16 inch) safety distance at all sides from other components
and equipments. Please insert an insulation sheet between the system and product, if the safety distance is less than 4mm (0.16inch).
••

Use flexible cable (stranded or solid) of AWG No. 22-16. Please refer to Table 1 for the recommended Housing and Terminal.
For the Remote ON/OFF function, use flexible cable (stranded or solid) of AWG No. 28-22.
Connector (Board
Mounting)
B3P5-VH(LF)(SN)

Table 1
Input (JST)Output (JST)Remote ON/OFF Function(Option)9

Housing

Terminal

VHR-5NV-

B7P-VH(LF)(SN)

VHR-7NV+

B6P-VH(LF)(SN)

VHR-6N

B2B-XH-A(LF)(SN)

XHP-2

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

SVH-21T-P1.1

SXH-001T-P0.6

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Mounting Orientation

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Any excessive twisting or bending may
damage the device’s PCB. Pleasehandle the device with care.
The device is not recommended to beplaced on low thermal conductive
surfaces. For example, plastics.
Prevent any foreign metal, particles or
conductors from entering the device
throughtheopenings
duringinstallation. It may cause: -Electric
shock; Safety hazard; Product failure.
The power supply must be mounted
by metal screws onto a groundedmetal
surface.
Itishighlyrecommended that the Earthterminal on the connector beconnected to the grounded metal
surface.

Engineering Data
Output Load De-rating VS Surrounding Air Temperature (Convection)
Open Frame / L Frame

Fig.1.1 De-rating for Mounting Orientation A> 50°C de-rate power by 2% / °C
De-rating for Mounting Orientation B, C
> 30°C de-rate power by 2.25% / °C
De-rating for Mounting Orientation D, E, F
> 25°C de-rate power by 2% / °C

10

Enclosed

Fig.1.2 De-rating for Mounting Orientation A> 40°C de-rate power by 2% / °C
De-rating for Mounting Orientation B, C
> 30°C de-rate power by 2.33% / °C
De-rating for Mounting Orientation D, E, F
> 25°C de-rate power by 2% / °C

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Output Load De-rating VS Surrounding Air Temperature (Forced Cooling: Air Velocity > 0.7m/s)


Air Flow Direction

Open Frame / L Frame

Fig.1.3 De-rating for Mounting Orientation A to F
> 60°C de-rate power by 2% / °C

Enclosed

Fig.1.4 De-rating for Mounting Orientation A to F
> 50°C de-rate power by 2% / °C

Notes
1.
2.

3.
4.

11

Power supply components may degrade, or be damaged, when the power supply is continuously used outside the shaded region,refer to the graphs shown above.
If the output capacity is not reduced when the surrounding air temperature is more than the upper limit temperature, the device will
run into Over Temperature Protection. When activated, the output voltage will latch off, until the surrounding air temperature islowered or the load is reduced as far as necessary to keep the device in working condition, and require removal/re-application of
input AC voltage in order to restart.
Depending on the surrounding air temperature and output load delivered by the power supply, the device housing can be very hot!
If the device has to be mounted in any other orientation, please contact info@deltapsu.com for more details.

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Output Load De-rating VS. Input Voltage
No output power de-rating for the input voltage
range from 90Vac to 264Vac

Functional Manual
Remote ON/OFF Function
You can remotely control the power supply unit toturn ON/OFF by using an external DC source.
Follow the DC power source voltage and current
limiting defined in the table below.

Built-in Resistor Ri (ohm)1kVoltage Between RC+ and RC- (V)Output ON

Output OFF

5-12.50-0.5

Input Current (mA)
20 Max

Notes
1. Remote ON/OFF circuits are isolated from input, output and PE.
2. Please check if the polarity of the wire connector is the same as the external DC source. If not, the power would not turn on and theinternal components may be damaged.
3. You do not need an external resistance RO for current limit while the output voltage of external DC source is within the range of 512.5V. If the output voltage exceeds 12.5V, please use the following equation for the value of current limit resistance RO.

𝑅𝑅𝑂𝑂 =

12

𝑉𝑉𝑉𝑉𝑉𝑉 − (3.5 + 0.006𝑅𝑅𝑖𝑖 )0.006

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
FunctionsStart-up TimeThe time required for the output voltage to reach 90% of its final steady state set value, after the input voltage is applied.

Rise TimeThe time required for the output voltage to change from 10% to 90% of its final steady state set value.

Hold-up TimeTime between the collapse of the AC input voltage, and the output falling to 95% of its steady state set value.

■ Graph illustrating the Start-up Time, Rise Time, and Hold-up Time

Inrush Current

Dynamic Response

Inrush current is the peak, instantaneous, input current
measured and, occurs when the input voltage is first applied.
For AC input voltages, the maximum peak value of inrush
current will occur during the first half cycle of the applied AC
voltage. This peak value decreases exponentially during
subsequent cycles of AC voltage.

The power supply output voltage will remain within ±5% of its
steady state value, when subjected to a dynamic load from 0 to
100% of its rated current.

13

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Power Boost
Power Boost is the reserve power available
constantly that allows reliable startup to
support sudden and short spike of loads withhigh inrush current typically during turn on toremove the need of more expensive higher
rated power supply unit. After the output hasreached its steady state set value, the power
supply can support surge loads with a higher
short-term power demand up to 200% of
maximum rated load (IO Max), for a
maximum duration of 10 seconds. The
Power Boost is also available to repeatedly
basis with according to the condition of an
average (R.M.S) output power shall not
exceed continuous operating condition orrefer to duty cycle calculation below.

𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷 𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐 (%) =𝑇𝑇𝑃𝑃; (𝑇𝑇𝑃𝑃 ≤ 10 sec)
𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴 𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 (𝑃𝑃𝐴𝐴𝐴𝐴𝐴𝐴 ) =OR

𝑁𝑁𝑁𝑁𝑁𝑁-𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 =(𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵 × 𝑇𝑇𝑃𝑃 ) + (𝑁𝑁𝑁𝑁𝑁𝑁-𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 × 𝑇𝑇𝑁𝑁 )𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇�𝑃𝑃𝐴𝐴𝐴𝐴𝐴𝐴 × 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇� − (𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵 × 𝑇𝑇𝑃𝑃 )𝑇𝑇𝑁𝑁An example of Power Boost and Average Output PowerPower Boost

Peak Power(WP)

Power Boost
Duration (TP)Duty Cycle

Non-PeakPower (WN)

Non-Peak Power
Duration (TN)Total Time
(T)

200%

600W

10 sec15%247.07W

56.67 sec

66.67 sec

200%

600W

5 sec

15%

247.07W

28.33 sec

33.33 sec

150%

450W

10 sec40%

200W

15 sec25 sec

150%

450W

5 sec

40%

200W

7.5 sec

12.5 sec

It is not recommended to prolong the duration of Power Boost to be longer than the specified duty cycle calculation, this may cause
damage to the PSU.

14

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
Overload & Overcurrent Protections (Auto-Recovery)

Overvoltage Protection (Latch Mode)

The power supply’s Overload (OLP) and Overcurrent (OCP)
Protections will be activated when output current exceeds 220% of
IO (Max load). In such occurrence, the VO (output voltage) will start
to droop and once the power supply has reached its maximum
power limit, the protection will be activated and the power supply
will go into “Hiccup mode” (Auto-Recovery). The power supply will
recover once the fault condition of the OLP and OCP is removed
and IO is back within the specifications.

The power supply’s overvoltage circuit will be activated when its
internal feedback circuit fails. The output voltage shall not exceed
its specifications defined on Page 3 under “Protections”. Powersupply will latch off, and require removal/re-application of input AC
voltage in order to restart.
The power supply should be latch.

Over Temperature Protection (Latch Mode)
It is not recommended to prolong the duration of IO when it is<220% but >100%, since it may cause damage to the PSU.

Short Circuit Protection (Auto-Recovery)
The power supply’s output OLP/OCP function also provides
protection against short circuits. When a short circuit is applied, theoutput current will operate in “Hiccup mode”, as shown in theillustration in the OLP/OCP section on this page. The power supply
will return to normal operation after the short circuit is removed.

15

As described in load de-rating section, the power supply also has
Over Temperature Protection (OTP). In the event of a higher
operating temperature at 100% load; or, when the operating
temperature is beyond what is recommended in the de-rating
graph, the OTP circuit will be activated. When activated, power
supply will latch off, until the surrounding air temperature drops toits normal operating temperature or the load is reduced asrecommended in the de-rating graph. Removal/re-application of
input AC voltage will then be required in order to restart.

All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
www.DeltaPSU.com (January 2020, Rev. 00)

TECHNICAL DATASHEETPJB Open Frame Power Supply
24V 300W 1 Phase / PJB-24V300W□□A
OthersConformal Coating
The Protective Coating Technology
Delta Electronics Group has designed the perfect dipping technique which penetrates everywhere including underdevice, and prevents leakage. The conformal coating dipping can be applied to PCBs or circuit board. The coatingpreserves the performance of precision electronic primarily by preventing ionizable contaminants such as salt
from reaching circuit nodes, where the material slumps around sharp edges. This can be a problem especially inhighly conversing atmosphere.

PFC – Norm EN 61000-3-2
Line Current Harmonic content
Typically, the input current waveform is not sinusoidal due to the periodical peak charging of the input capacitor.
In industrial environment, complying with EN 61000-3-2 is only necessary under special conditions. Complying tothis standard can have some technical drawbacks, such as lower efficiency as well as some commercial aspects
such as higher purchasing costs. Frequently, the user does not profit from fulfilling this standard, therefore, it isimportant to know whether it is mandatory to meet this standard for a specific application.

Attention
Delta provides all information in the datasheets on an “AS IS” basis and does not offer any kind of warranty through the information forusing the product. In the event of any discrepancy between the information in the catalog and datasheets, the datasheets shall prevail(please refer to www.DeltaPSU.com for the latest datasheets information). Delta shall have no liability of indemnification for any claim or
action arising from any error for the provided information in the datasheets. Customer shall take its responsibility for evaluation of using
the product before placing an order with Delta.
Delta reserves the right to make changes to the information described in the datasheets without notice.

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All parameters are specified at 25°C ambient and AC input unless otherwise indicated.
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