Ex solenoid interlock

Ex STM 298-3G/D

  • Ex zone 2 and 22

  • Metal enclosure

  • Wiring compartment

  • Spring-to-lock or power-to-lock principle

  • With auxiliary release for service, maintenance, etc.

  • 1 ATEX cable gland is included in delivery

  • The actuator is not included in the delivery of the switches

Technical data

Applied standards

EN 60947-5-1, EN IEC 60079-0, EN 60079-15, EN 60079-31, EN ISO 13849-1, EN ISO 14119


die-cast alloy

Switch type

type 2

Coding level

low coding

Degree of protection

IP67 (IEC/EN 60529)


12 million (bei DC-13 100 mA/24 V)

Mechanical life

1 million operations

Ambient temperature

–20 °C … +75 °C

Degree of pollution


Mounting position


Actuating speed V

max. 20 m/min

Extraction force (not locked)

30 N

Retention force

20 N

Actuating force

max. 35 N

Operation cycles

max. 1200/h

Switching system

slow action

Contact material

Silver, gold flashed

Cable entry

3 x M20 x 1.5 (incl. 1 cable gland)

Clamping range

6,5 … 12 mm

Cable cross-section

0.34 … 1.5 mm² (flexible/fixed)

Rated insulation voltage Ui

50 V

Rated impulse withstand voltage Uimp

2.5 kV

Conditional short-circuit current

100 A

Switching voltage

min. 12 V at 10 mA

Utilisation category

AC-15; DC-13

Rated operating current/voltage Ie/Ue

4 A/50 VAC; 4 A/24 VDC

Switching current

min. 1 mA at 24 V

Short-circuit protection

4 A gG fuse (IEC 60269-1)

Conventional thermal current Ithe

4 A

Solenoid operating voltage Us

24 V AC/DC (+10%/–15%)

Power consumption

8 W

Switch-on time ED

100 %

Locking force Fmax

actuator straight: 3000 N
actuator angled: 1500 N
actuator flexible: 3000 N

Locking force FZh

(FZh = Fmax/1.3) = 2300 N

Impact energy

max. 7 J

Ex marking

L II3G Ex nR IIB T4 Gc X
L II3D Ex tc IIIC T110°C Dc X


Mounting and wiring instructions – Ex STM 298-3G/D

German, English, French

PDF 5 MB 19.09.2023
Mounting and wiring instructions – Ex STM 298-3G/D

German, English, Italian

PDF 5 MB 19.09.2023
Please go to the relevant product pages for additional downloads.