This Euchner STP1 safety switch operates on the closed-circuit current principle, with guard locking maintained by spring force and released by applying voltage to the guard locking solenoid. It provides slow-action switching with 2 NC and 2 NO contacts, plus guard lock monitoring via positively driven and NO contacts, giving reliable status feedback for the interlocking circuit. The switch features a reinforced thermoplastic housing with silver alloy, gold-flashed contacts, an IP67 degree of protection and an ambient temperature range of -20 to 55°C, suiting it to demanding industrial guarding applications where any mounting orientation is required. An auxiliary release, locking screw and LED indicator support installation and maintenance on machine guards and safety doors.
Key specifications
| STP1 | Closed-circuit current principle, guard locking by spring force. Release by applying voltage to the guard locking solenoid. |
| 4131 | Slow-action switching contact 2 NC + 2 NO |
This is used for releasing the guard locking with the aid of a tool. To protect against tampering, the auxiliary release is sealed with sealing lacquer.
| 1 | Auxiliary release |
| 2 | Locking screw |
| 3 | LED indicator |
| Power consumption | 8 W |
| Connection cross section | 0.34 - 1.5 mm² |
| Display module | 24 V -15% - +10% |
| Rated insulation voltage Ui | 250 V |
| Rated impulse withstand voltage Uimp | 2.5 kV |
| Utilization category | |
| DC-13 | 4 A 24 V |
| AC-15 | 4 A 230 V |
| Short circuit protection according to IEC 60269-1 | 4A gG |
| Solenoid operating voltage | AC/DC 24 V -15% - +10% |
| Solenoid duty cycle | 100 % |
| Switching voltage | min. at 10 mA 12 V |
| Switching current | min. at 24 V 1 mA |
| thermal rated current Ith | 4 A |
| Approach speed | max. 20 m/min |
| Approach direction | A |
| Connection type | 3 x M20 x 1.5 |
| Number of guard lock monitoring NO contacts | 2 |
| Number of guard lock monitoring positively driven contacts | 2 |
| Extraction force | 30 N |
| Actuation frequency | max. 1200 1/h |
| Actuating force | 35 N |
| Installation orientation | any |
| Insertion depth | 24.5 mm |
| Mechanical life | 1 x 10⁶ |
| Retention force | 20 N |
| Switching principle | Slow-action switching contact |
| Degree of protection | IP67 |
| Ambient temperature | -20 to 55 °C |
| Material | |
| Housing | Reinforced thermoplastic |
| Contact | Silver alloy, gold flashed |
| Locking force Fmax | 2500 N |
| Locking force FZh | 2000 N |
| Guard locking principle | Closed-circuit current principle |
Data sheet
EU declaration of conformity
| EDC20001551 |
Operating Instructions Safety Switch STP…
Safety information
Approvals and certificates
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| Item designation | STP1A-4131A024L024M |
| Gross weight | 0,492kg |
| Customs tariff number | 85365019000 |
| ECLASS | 27-27-26-03 Safety switch with guard control |