Guard Locking Safety Switch 1NO 2NC
Guard locking safety interlock switches with 1NO + 2NC contact configuration - the most common combination for machine door interlocks with two safety channels and one auxiliary. Supplied ex-stock in India.
1NO + 2NCDual Safety Channel24VDC SolenoidIndia Supply
The 1NO + 2NC contact block gives two force-guided NC safety contacts (for dual-channel wiring to a safety relay) and one NO auxiliary contact (for status feedback to PLC).
Why 1NO + 2NC?
- Two safety NC contacts enable dual-channel monitoring - required for PL e / SIL 3.
- Force-guided contacts detect welded contacts on next cycle.
- The NO auxiliary is used for door-open / door-closed feedback to PLC.
Popular 1NO 2NC Models
| Schmersal | AZM 200 12/12 (1NO+2NC available) |
|---|---|
| Omron | D4NL-...HG (1NO+2NC) |
| Allen-Bradley | 440G-LZ 1NO+2NC configuration |
FAQ
Can I get 2NO+2NC instead?
Yes, most brands offer 2NO+2NC variants for extra auxiliary contacts.
Are the safety contacts positive-opening?
Yes, positive-opening as per EN 60947-5-1 Annex K.