CAM-OPERATED SWITCHB TYPE, BH TYPETECHNICAL DATA
Breaking and making current capacity
ACTypeDC

Test voltage (V) Test current (A)B, BH, BHL

121165242

11048433——

Load condition

Test voltage (V) Test current (A)Power factor:
Pf = 0.6 to 0.7

26.4

1152.8

6.6

121

1.65

242

0.88

Load condition

Time constant:
L / R = 40±6ms

Breaking / making circuit current capacity test
To conduct the opened / closed circuit current capacity test, connect the reactor or inductance, which is connected in series to aresistor, to the switch as illustrated in Fig. 1 or 2. Using the test current specified in Table 1, perform CO 50 times for AC and 20times for DC at intervals of 10 seconds when the voltage is 1.1 times the rated operating voltage of the switch. At this test,
check for:(1) Short-circuit between poles or earth fault due to generated arc, or broken or burnt switch.
(2) Any other harmful fault in use
Note: CO means performing the closing action (C) and then the opening action (O) about 50 ms later. For a switch that has
some identical structures used for the same electric potential, select an adjacent contact or a contact that is most likely tolead the arc to the frame and then carry out the test using the circuit shown in Fig. 1.

Fig.1

Fig. 2Current(AC or DC)

Current(AC or DC)
Protective fuse

Test sample
Non-live metallic part to be
grounded and non-live
metallic part that may betouched by humans.

Non-live metallic part to begrounded and non-live
metallic part that may betouched by humans.

Test sample

Testing fuse (bare copper
wire: 0.1 mm in diameterand 50 mm in length)

Testing fuse (bare copper
wire: 0.1 mm in diameterand 50 mm in length)

Resistor that allows currentof about 100 A to flow atshort-circuit

Resistor that allows currentof about 100 A to flow atshort-circuit

Connect to power sourceⅠ
for the first half of the test
counts and to powersourceⅡfor the second half.

Note: For DC, connect a parallel resistor so that 1% of the test current value flows in parallel with the loads (R·L).

Table 1AC、or DC交AC流

直DC流

Note:

Test current
MakingBreaking

Power factor (AC) ortime constant (DC L / R: ms)

1.1Ue

11.0 le11.0 le0.6 to 0.7

1.1Ue

2.2 le2.2 le0.6 to 0.7

AC131.1Ue

1.1 le1.1 le0.9 to 1.0

DC111.1Ue

1.1 le1.1 le100±15DC121.1Ue

1.1 le1.1 le40±6DC131.1Ue

1.1 le1.1 le7±1

DC141.1Ue

1.1 le1.1 le1 max.

Class

Test voltage

AC11AC12

shows for the rated operating current andshows the rated operating voltage.

Switching time T1 (ms)(Example: BA-6 8A8B)

Resistance of coil
Voltage 48V DC 100 / 110V DC 125V DC 200 / 220V DCResistance

A5725Ω55Ω

80Ω

350Ω

6050

Closing timeCoilContact
T140302048V DC
200 / 220V DC
100 / 110V DC 125V DC

10100
15050
Applied voltage (V DC)

200

Switching time T2 (ms)Switching speed of lockout relay
60

Opening time

50CoilContact
T240302010200 / 220V DC
48V DC
100 / 110V DC 125V DC
10015050
Applied voltage (V DC)

Note: The above voltage values shows the rated values of the coils.

200SWITCH50 max.

Withstand voltage between contacts (V AC)

2,500

Insulation resistance (Ω)

1,000M

Max. current carrying capacity (A)

2.0

Max. breaking voltage (V)110 DC / 110 ACMax. breaking current (A)0.5 DC

Min. applicable load

5V DC, 1mA

Shock resistance (m/s2)

50

Vibration resistance (m/s )22

Terminal screw M4×9

Unit color

Ｇ : Minute electric○current contact

Semitransparency
blue(Twin contacts)

Colorless and clear●Standard contact

Display example of the above switch:
BY-H5-1B1A1BL1AL2BX2AX1BLX1ALX■The operating load range is as shown in the following graph.
Select a contact type according to your application.
Load area
1000500

1005010

Operating temperature (°C)

–20 to 60

 Resistance load

Minute electric
current contact(Twin contacts)

Standardcontact(silver contact)510.0001

0.001

0.010.1（A）

110100■Contact protective circuit
If inductive load or load that causes surge current (rush current) to flow (load-carrying capacity, lamp, long cable, or the like) isused as the load for the twin contacts, a contact protective circuit is required and shown below:●Inductive loadLoad

B PILOT LAMP & INDICATOR

Twin contactsTwin contacts●Load-carrying capacity●Wiring capacity

LoadWiringcapacity

C CONNECTING DEVICES

Contact spec
Contact resistance (mΩ)

■BY type contact unit（V）

Environmentalcharacteristics

Electrical characteristics●The specification and performance are shown in the following table.

A SWITCH

BY type minute electric current switch■The BY type switch is used to make / break a sequencecontrol current or any other similar low-voltage, minuteelectric current circuit. It consists of a contact unit thatuses twin contacts.
■The BY type switch allows for manufacturing an operation
switch that only uses the BY type contact unit. It also
allows for manufacturing a switch that incorporates boththe BY type contact unit and the standard contact (silvercontact) unit (see the right figure).
 A silver contact and gold contact cannot be combined in asingle unit.
■The contact unit of the BY type switch has its housing
designed as semitransparency blue, so that it can bediscriminated from the standard type.

Load

If any electromagnetic relay, solenoid, or counter
having an inductance component is used as load,
the energy stored in the inductance causes
reverse voltage to be generated when thecontacts are separated from each other. This
reverse voltage reaches even several hundred
volt, which can cause remarkable deterioration ofthe contacts. As a protective circuit, the above
method is available.

In this case, a capacitor is connected in parallelor in series in a closed circuit including twincontacts. The rush current that flows when thecapacitance is charged or discharged can cause
remarkable deterioration of the contacts. To
prevent this rush current, the above method is
generally known and should be used for yourreference.

If wiring is carried out at a long distance
between the load and twin contacts, thecontacts are affected by the capacitanceresulting from the cable. Ls differs depending on
the load current, but approximately 0.5 to 5 mH
is assumed for the circuit.

A58

D ELECTRONIC DEVICES

max.