Pilz PNOZsigma safety relays 751103 (PNOZ s3 C) and 751330 (PNOZ s30 C) are, as of 2026, standard, compact, DIN-rail mounted modules designed to monitor safety functions. The 751103 is a 24VDC 2-channel relay for emergency stops and safety gates, while the 751330 is a 24-240VAC/DC device specialized in speed and standstill monitoring.

• Function: Monitors E-STOP, safety gates, and light curtains.
• Input/Output: 1/2-channel wiring, 2 safety contacts (N/O), 1 auxiliary contact (SC).
• Voltage: 24 VDC.
• Features: Manual or automatic start, plug-in spring-loaded terminals, 17.5mm width.

• Function: Standstill and speed monitoring, suitable for speed-related safety functions (e.g., safe speed).
• Input/Output: 2 safety contacts (N/O), 2 auxiliary contacts (N/C).
• Voltage: 24 - 240 V AC/DC.
• Features: Push-turn display knob, 45mm width, pluggable spring-loaded terminals.

Both units feature internal redundancy and self-monitoring to ensure that, in case of component failure, the safety function remains effective