The Pilz PNOZ s5 (750105) and PNOZ s5 C (751105) are high-performance safety relays from the PNOZsigma series designed for monitoring emergency stop buttons, safety gates, and light curtains. The primary difference between these two models is the terminal type: the 750105 uses standard screw terminals, while the 751105 features plug-in spring-loaded (push-in) terminals for easier, vibration-resistant wiring. [1, 2, 3, 4, 5]

• Safety Contacts: 4 Normally Open (N/O) total.
  • 2 Instantaneous: For immediate machine shutdown.
  • 2 Time-Delayed: Configurable delay (0.04 to 300 seconds) for controlled stopping of hazardous movements.
• Inputs: Supports 1-channel or 2-channel wiring with or without cross-wire short detection.
• Operating Modes: Features selectable automatic start, manual start, or monitored manual reset.
• Supply Voltage: 24 V DC.
• Compact Design: Narrow 22.5 mm width for DIN-rail mounting. [1, 2, 3, 6, 7, 8, 9]

These relays are typically used for:

• E-STOP Monitoring: For both instantaneous and delayed emergency stops.
• Safety Gates: Monitoring electrical locking devices and gate positions.
• Light Barriers: Compatible with Type 2 and Type 4 light beam devices.
• Safe Timers: Acting as a safe delay-on de-energization timer.