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
  • Attention: Please state required international approvals with your order!
Note
  • The actuator is not included in the delivery of the switches

Technical data

Applied standards EN 60947-5-1, EN ISO 14119, EN 60079-0, EN 60079-1, EN 60079-7, EN 60079-18, EN 60079-31, EN ISO 13849-1
Enclosure thermoplastic, glass-fibre reinforced, impact resistant, self-extinguishing UL 94 V-0
Actuator stainless steel 1.4301
Switch type type 2
Coding level low coding
Tightening torque cover screws: 0.5 … 0.6 Nm
switch inserts M3 screw connection terminals: min. 0.6 Nm
solenoid M3.5 screw connection terminals: min. 0.8 Nm
Degree of protection IP 64 to IEC/EN 60529
B10d (10 % load) 1 million
TM max. 20 years
Contact material silver
Switching system slow action, positive break NC contacts
Switching elements 2 NC/2 NO, 3 NC/1 NO or 4 NC/2 NO contact, type Zb
Connection screw connection terminals
Cable cross-section min. 0.2 mm² / AWG 24, max. 1.5 mm² / AWG 16
Cable entry 2 x M20 x 1.5
Clamping range 7 … 12 mm
Rated insulation voltage Ui 250 V
Rated impulse withstand voltage Uimp 4 kV
Utilisation category AC-15; DC-13
Rated operating current/voltage Ie/Ue enabling/signalling contacts:
3 A/250 VAC; 0.25 A/230 VDC or 1.5 A/250 VAC; 0,25 A/230 VDC;
direct-current solenoid:
0.08 A / 24 VDC +10 %/–15 % 
Short-circuit protection 3 A / 1.5 A gG/gN fuse;
direct-current solenoid: 2 A (slow blow)
Power consumption >2.5 VA (continuous operation)
max. 47 VA (for 250 ms)
Operation cycles max. 1200/h
Mechanical life > 500 000 operations
Locking force Fmax 1000 N
Impact energy max. 7 J
Ambient temperature –20 °C … +55 °C
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
Approvals BVS 10 ATEX E 053 X
IECEx BVS 11.0030X
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* depending on the variant (see » Certificates)

Ordering details

Spring-to-lock principle

Type   Material no.  
Type    Material no.   
Ex STM 295 1Ö1S/1Ö1S-R 1186429
Type    Material no.   
Ex STM 295 1Ö1S/1Ö1S-R/90° 1188541
Type    Material no.   
Ex STM 295 2Ö/1Ö1S-R 1445357

Spring-to-lock principle + with manual release FE

Type   Material no.  
Type    Material no.   
Ex STM 295 1Ö1S/1Ö1S-R-FE 1186394
Type    Material no.   
Ex STM 295 1Ö1S/1Ö1S-R/90°-FE 1188545
Type    Material no.   
Ex STM 295 1Ö1S/2Ö-R-FE 1333024
Type    Material no.   
Ex STM 295 2Ö/1Ö1S-R-FE 1187282
Type    Material no.   
Ex STM 295 2Ö/1Ö1S-R/90°-FE 1188546
Type    Material no.   
Ex STM 295 2Ö1S/2Ö1S-R-FE 1249920
Type    Material no.   
Ex STM 295 1NC1NO/1NC1NO-R-FE JPEx 1319584

Power-to-lock principle

Type   Material no.  
Type    Material no.   
Ex STM 295 1Ö1S/1Ö1S-A 1184799
Type    Material no.   
Ex STM 295 1Ö1S/1Ö1S-A/90° 1188542
Type    Material no.   
Ex STM 295 2Ö/1Ö1S-A 1188560
Type    Material no.   
Ex STM 295 2Ö1S/2Ö1S-A 1443318

Actuators

Type   Material no.  
Type    Material no.   
Straight actuator STM 295-B1 1183481
Type   Material no.  
Type    Material no.   
Angled actuator STM 295-B5 1183470
Type   Material no.  
Type    Material no.   
Flexible actuator STM 295-B6 1435030