Ex STM 295


  • Ex zone 1 and 21
  • Thermoplastic enclosure
  • Wiring compartment
  • Spring-to-lock or power-to-lock principle
  • Two Ex switch inserts in one enclosure
  • Double insulated
  • Locking force 1000 N
  • Actuator can be repositioned by 90° on request
  • Special version only for gas Ex zone 2 and dust Ex zone 22 available
  • N.B.: Please state required international approvals with your order!
  • The actuator is not included in the delivery of the switches

Technical data

StandardsEN 60947-5-1; EN ISO 14119;
EN 60079-0, -1, -7, -18, -31;
EN ISO 13849-1
Enclosureglass-fibre reinforced, shock-proof thermoplastic (PA 66), self-extinguishing UL 94-V0
Actuatorstainless steel 1.4301
Switch typetype 2
Coding levellow coding
Tightening torquecover screws 0.5 … 0.6 Nm, switch inserts M3 screw clamps min. 0.6 Nm, solenoid M3.5 screw clamps min. 0.8 Nm
Degree of protectionIP 64 to IEC/EN 60529
Contact materialsilver
Switching systemslow action, positive break NC contacts
Switching elements2 NC/2 NO or 3 NC/1 NO contact, type Zb
Connectionscrew connection terminals
Cable cross-sectionmax. 1.5 mm² (incl. conductor ferrules)
Cable entry2 x M20 x 1.5 for
cable section 5 … 9 mm
B10d (10 % Load)1 million
TMmax. 20 years
Uimp4 kV
Ui250 V
Ithe3 A
Ie/Ue3 A/250 VAC; 0.25 A/230 VDC
Utilisation categoryAC-15; DC-13
Max. fuse rating6 A gG/gN fuse
Ie/Ue solenoid0.08 A / 24 VDC +10 %/–15 %
Power consumptionmax. 47 W (0.25 s)
Max. fuse rating solenoid2 A (slow blow)
Ambient temperature–20 °C … +55 °C
Mechanical life> 500 000 operations
Locking force Fmax1000 N
Impact energymax. 7 J
Ex marking II 2G Ex db eb mb IIC T4 Gb,
II 2D Ex tb IIIC T100 °C Db
IECEx Ex db eb mb IIC T4 Gb,
Ex tb IIIC T100 °C Db
ApprovalsBVS 10 ATEX E 053 X
IECEx BVS 11.0030X

Stock types

Ordering details
Type code

Spring-to-lock principle
2 NC/2 NO contacts

Type   Material no.
Ex STM 295 2Ö/2S-R 1186429
Ex STM 295 2Ö/2S-R/90° 1188541

Spring-to-lock principle
2 NC/2 NO contacts

with manual release FE

Type   Material no.
Ex STM 295 2Ö/2S-R-FE 1186394
Ex STM 295 2Ö/2S-R/90°-FE 1188545

Power-to-lock principle
2 NC/2 NO contacts

Type   Material no.
Ex STM 295 2Ö/2S-A 1184799
Ex STM 295 2Ö/2S-A/90° 1188542

Power-to-lock principle
3 NC/1 NO contact

Type   Material no.
Ex STM 295 3Ö/1S-A 1188560
Type   Material no.
Straight actuator STM 295-B1 1183481
Type   Material no.
Angled actuator STM 295-B5 1183470
Type   Material no.
Flexible actuator STM 295-B6 1435030
Type   Material no.
M5 triangular key 1182300