Schmersal PROTECT SRB 301ST-24V Safety-Monitoring Module
The Schmersal PROTECT SRB 301ST-24V (Part No. 101174668) is a safety-monitoring relay module designed for emergency stop, safety gate, and machine safety applications. Operating on 24 VAC/VDC, it evaluates dual-channel safety circuits from E-stop buttons, mechanical safety switches, and magnetic safety sensors to ensure reliable machine protection. The module provides 3 safety NO outputs and 1 auxiliary NC contact, offering dependable safety control and status monitoring. Designed for 35 mm DIN-
BRAND
SCHMERSAL / ELAN
TYPE
Safety-Monitoring Relay Module
PART NO.
101174668
MODEL
SRB 301ST-24V
Full Technical Specifications ▶
| Parameter | Value / Description |
|---|---|
| BRAND | SCHMERSAL / ELAN |
| TYPE | Safety-Monitoring Relay Module |
| PART NO. | 101174668 |
| MODEL | SRB 301ST-24V |
| Voltage Rating | 24 VDC / VAC (via clamp A1 / A2) |
| Application | Evaluation of dual-channel safety loops from mechanical switches, E-stop buttons, or magnetic safety sensors |
| IEC | EN 60204-1 / EN ISO 13849-1 / IEC 61508 / IEC 60947-5-1 |
| Internal Switching Layout | 3 NO (Normally Open) safety paths | 1 NC (Normally Closed) auxiliary signaling path |
| Current Consumption | Max. 80 mA |
| Safety Switching Capacity (NO) | DC13: 24 V / 6 A | AC15: 230 V / 6 A maximum output limits |
| Auxiliary Switching Capacity (NC) | NC Contact (Signaling 41-42): 24 VDC / 2 A maximum signaling load limits |
| Rated Insulation Voltage | 250 V AC |
| Short-Circuit Protection | Internal line security protected by an integrated electronic fuse > 500 mA |
| Wiring Cross-Section Limits | 28-12 AWG |
| Enclosure Protection Class | IP40 upper housing face plate coverage | IP20 finger-safe terminal arrays |
| Mounting Orientation | 35 mm DIN rails |
| Made In | Germany |
| REF NO | 160 |
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