T 3773 EN
Type 3773 Limit Switch

Application
Limit switch with inductive proximity switches or electric microswitches for attachment to rotary actuators according toVDI/VDE 3845, level 1 and level 2

The Type 3773 Limit Switch issues an electric signal when thevalve travel exceeds or falls below an adjusted limit. The signal is suitable for switching control signals, issuing visual andaudible alarms or for connection to central control or alarmsystems.
Special features• Electrical connection using M20x1.5 to screw terminals orcage clamp terminals (0.5 to 2.5 mm²)
• Corrosion-resistant plastic housing with degree of protection IP 65 for adverse environmental conditions• Permissible ambient temperature –40 to 80 °C• Mounting kits for rotary actuators with interface according
to VDI/VDE 3845
• Type of protection Ex ia

Fig. 1: Type 3773 Limit Switch• Continuously adjustable limit contacts
Versions–

Type 3773-xxx0: Limit switch with two inductive proximity
switches, switching point adjustable between 0 and 100°–

Type 3773-xxx2: Limit switch with two electric microswitches, switching point adjustable between 0 and 100°

Fig. 2: Attachment to rotary actuators according to VDI/VDE 3845, level 1

SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 · samson@samsongroup.com · www.samsongroup.com

Edition November 2021

Design and principle of operation
The shaft (1) of the limit switch is connected to the actuator
shaft using an adapter. For most applications the contacts areadjusted to issue a signal when the actuator has reached oneof its end positions. Two adjustment screws (3) are used tocontinuously adjust the switching point to any position within
the opening angle to signalize an intermediate position.

Version with inductive proximity switches

Version with inductive proximity switches
The limit switch has adjustable metal tags (5) on the shaft.
When the tag is inside the magnetic field of the proximity
switch (4), the proximity switch is attenuated and the output
has a high impedance (switching function “Contact open”).
When the tag leaves the magnetic field, the proximity switch isunattenuated and the output has a low impedance (switchingfunction "Contact closed"). The tag can be adjusted to aswitching point between 0 and 100° at the adjustment screw
(3).

54

3

Version with electric microswitches
The limit switch has two adjustable cam disks (7) on the shaft.
The cam disk activates the electric microswitch (6) over theroller on the switch lever. The cam disks can be adjusted to aswitching point between 0 and 100° at the adjustment screws
(3).

4

3
5

Legend for Fig. 3 and Fig. 4:
123
4
5
6
7

Shaft
Terminals (screw terminals in this example)
Adjustment screwsProximity switch
Metal tagMicroswitch
Cam disk

Version with electric microswitches

66123233737Fig. 3: Operating controls of the Type 3773 Limit Switch
Fig. 4: Versions of the Type 3773 Limit Switch

2T 3773 EN

Technical data
Type 3773 Limit Switch
Range of rotation

0 to 100°

Electromagnetic compatibility

Complying with EN 61000-6-2, EN 61000-6-3 and NAMUR Recommendation NE 21

Degree of protection

IP 65

Explosion protection

Zündschutzart II 2/3 G/D Ex ia T6

Electrical connection

1x cable gland M20x1.5

Number of contacts

2Permissible ambient temperature 1)–40 to +80 °C

WeightApprox. 0.4 kg1)

Observe the temperature limits in the test certificate for explosion-protected versions.

Technical data · Inductive proximity switch
Version-02

-04

-05

SC3,5-N0-WH

SJ3,5-SN

SJ3,5-S1N

Switching function

NAMUR NC contact

Switching accuracy

NAMUR NO contact

0.06 to 0.1 mm<0.2 mm<0.3 mm–40 to +80 °C–40 to +80 °C–40 to +80 °C-04-05Control circuit
Temperature 1)

Limit contact in type of protection Ex ia IIC for use in hazardous areas (Zone 1)-02

Version16 V DCOutput voltage

Ui

Output current

Ii

52 mA

Power dissipation

Pi169 mW

Outer capacitanceCi

150 nF

30 nF

Outer inductance

Li150 µH

100 µHTemperature1)–40 °C ≤ Ta ≤ +45 °C

The permissible ambient temperature depends on the permissible ambient temperature of the components, type of protection and temperature class.
A restricted temperature range may arise for SIL applications.

Technical data · Electric microswitches
VersionContact

-20

-21

XGK19-88-S20

XGK12-81-S20

Silver contact

Gold contact

Switching function

Changeover contact/SPDT (single-pole/double-throw type)Switching accuracy
Temperature 1)

On request

On request–40 to +80 °C–40 to +80 °C

Permissible contact load

250 V AC/10 A · 125 V DC/0.5 A · 24 V DC/10 A

Limit switch in type of protection Ex nA II for use in hazardous areas (Zone 2 or 22)-20

Version-21

Output voltage

Ui

28 V

Output current

Ii

115 mA

Power dissipation

Pi

500 mW

Outer capacitance

Ci

0 nF

Outer inductance

Li0 µH

Temperature1)–40 °C ≤ Ta ≤ +80 °C

The permissible ambient temperature depends on the permissible ambient temperature of the components, type of protection and temperature class.
A restricted temperature range may arise for SIL applications.
Materials
Housing

Polyarylamide PA MXD6 – GF50

Housing cover

Polycarbonate (PC) Makrolon®

Follower shaft
Housing breather

Polyoxymethylene (POM)
Polyethersulfone on PET nonwoven fabricScrewsStainless steel A4-70

Terminals

Polyamide 6.6T 3773 EN3

Summary of explosion protection approvals-110-111

Type 3773

Certification

Type of protection/comments

EU type examination certificate

IECEx

NumberTÜV 18 ATEX 8323 XDate2019-04-13

NumberIECEx TUR 19.0010X

Date2019-04-13

II 2G Ex ia IIC T4/T6 Gb
II 2D Ex ia IIIB T95°C Db
Ex ia IIC T4/T6 Gb
Ex ia IIIB T95°C Db

Dimensions in mm

88555188

Ø5089454088

109~271194

T 3773 EN

Article code
Limit switch

Type 3773-xxxxx

000

1

10

1

10

Inductive SC3,5-N0-WH (–40 to +80 °C)

02

Inductive SJ3,5-SN (–40 to +80 °C)

05

Inductive SJ3,5-S1N (–40 to +80 °C)

06Microswitch XGK19-88-S20
with silver contact (–40 to +80 °C)

20Microswitch XGK12-81-S20
with gold contact (–40 to +80 °C)

2

1xxxxx0xxx000xx

99Explosion protection
Without
ATEX:

II 2G Ex ia IIC T4/T6 Gb
II 2D Ex ia IIIB T95°C Db

IECEx: Ex ia IIC T4/T6 Gb
Ex ia IIIB T95°C Db
Limit contact

Number of contacts
Two contacts

2Switching angle<100°0Terminals
Screw terminals

1Cage clamp terminals

2Electrical threaded connections
M20x1.5

1Degree of protection
IP 65

0Housing material
Black plastic (polyarylamide PA MXD6 – GF50)

0CoverBlue plastic (polycarbonate (PC) Makrolon®)

0Permissible ambient temperature–25 to +80 °C (+65 °C in T6)

0Hardware version
Index: 00

T 3773 EN5

T 3773 EN

2021-11-10 · English

Specifications subject to change without notice