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- Ex zone 1 and 21
- Ex STM 295
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- Ex zone 2 and 22
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- Ex zone 22
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Ex STM 295
Features/Options
- 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
- Holding 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!
Note
- The actuator is not included in the delivery of the switches
Technical data
Standards | EN 60947-5-1; EN ISO 14119; EN 60079-0, -1, -7, -18, -31; EN ISO 13849-1 |
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Enclosure | glass-fibre reinforced, shock-proof thermoplastic (PA 66), self-extinguishing |
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 clamps min. 0.6 Nm, solenoid M3.5 screw clamps min. 0.8 Nm |
Degree of protection | IP 64 to IEC/EN 60529 |
Contact material | silver |
Switching system | slow action, positive break NC contacts ![]() |
Switching elements | 2 NC/2 NO or 3 NC/1 NO contact, type Zb |
Connection | screw connection terminals |
Cable cross-section | max. 1.5 mm² (incl. conductor ferrules) |
Cable entry | 2 x M20 x 1.5 for cable section 5 … 9 mm |
B10d (10 % Load) | 1 million |
TM | max. 20 years |
Uimp | 4 kV |
Ui | 250 V |
Ithe | 3 A |
Ie/Ue | 3 A/250 VAC; 0.25 A/230 VDC |
Utilisation category | AC-15; DC-13 |
Max. fuse rating | 6 A gG/gN fuse |
Ie/Ue solenoid | 0.08 A / 24 VDC +10 %/–15 % |
Power consumption | max. 47 W (0.25 s) |
Max. fuse rating solenoid | 2 A (slow blow) |
Ambient temperature | –20 °C … +55 °C |
Mechanical life | > 500 000 operations |
Holding force F | max. 1000 N |
Impact energy | max. 7 J |
Ex marking | ![]() ![]() 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 ![]() ![]() ![]() |
Stock types
Ordering details |
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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 |
Actuators |

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 |
Accessories |

Type | Material no. | |
M5 triangular key | 1182300 |