Allen-Bradley 100S-F Safety Contactor Series

The Allen-Bradley 100S-F, also cataloged as the 100S-F Safety Contactor, operates as a dedicated hardware component for fail-safe power switching within industrial safety circuits. The contactor features mechanically linked auxiliary contacts and mirror contacts to provide positive-guided feedback to safety relays and safety controllers when switching high-current motor loads or isolation circuits.

Hardware Specifications

I/O Density Scaling & Deterministic Safety Execution

Configured with high-density auxiliary contact blocks, the 100S-F safety contactor ensures deterministic backplane feedback and I/O density scaling within Allen-Bradley GuardMaster and GuardLogix control systems. The dual-channel mirror contact design guarantees that if a main power pole welds shut, the auxiliary safety contact remains open, preventing safety circuit reset. Built with strict firmware flash compatibility standards across safety monitoring systems, it provides immediate hardware execution for two-hand control, machine guarding interlocks, and E-stop shutdown loops.

Frequently Asked Questions

Q: Can auxiliary contact blocks be added or removed from the 100S-F safety contactor in the field?

A: To maintain SIL3 and Category 4 safety certification ratings, factory-installed protective covers on the 100S-F prevent the unauthorized addition or removal of front-mounted auxiliary contact blocks.

Q: How do mechanically linked auxiliary contacts function during a contact welding event?

A: If a primary power pole welds closed due to an overcurrent surge, the internal mechanical linkage prevents the normally closed (NC) auxiliary contacts from closing when the coil is de-energized, maintaining a fault state in the safety monitoring loop.

Field Installation Guidelines

1. Mount the contactor on a standard 35 mm DIN rail or secure it to an enclosure panel using M4 mounting screws. Maintain at least 10 mm lateral clearance for thermal heat dissipation.
2. Ensure the cabinet enclosure meets an IP54 or higher rating to protect the terminal contacts from conductive dust and fluid ingress.
3. Wire coil terminals and field auxiliary circuits using stranded copper wire rated for 75 deg C. Tighten screw terminals to the manufacturer-specified torque rating of 1.2 Nm.
4. Separate safety feedback control wiring from high-voltage AC motor lines to prevent EMI signal noise from coupling onto the monitoring loop.
5. Verify ground connection continuity across the panel backplate and ensure line-side overcurrent protection devices (fuses or circuit breakers) are sized in according to local electrical codes.