700-FSK3CU23-EX | Allen-Bradley | 700-FS Series One-Shot Watchdog Timing Relay

Product Overview

The Allen-Bradley 700-FSK3CU23-EX functions as a high-precision, DIN-rail-mounted electronic timing relay within the high-performance 700-FS product family. This specialized control device executes pulse-controlled One-Shot and Watchdog timing functions to monitor sequence durations, regulate pulse intervals, and protect automation systems from stalling conditions.

We supply this industrial timing component exclusively as a 100% brand new, original factory-sealed unit, guaranteeing untouched internal solid-state logic, pristine dual-frequency internal coil structures, and immaculate terminal assembly surfaces directly from the manufacturer.

Technical Specifications

The following profile outlines the precise electrical parameters, functional modes, and mechanical specifications of the 700-FSK3CU23-EX timing relay:

Engineering Advantages

• Eliminates Separate Power Supply Overhead: The multi-voltage internal coil accepting 24–48V DC and 24–240V AC allows design engineers to stock a single model across diverse facility voltages. This universal input stage eliminates the need to allocate extra enclosure space for step-down control transformers or standalone DC power supplies.

• Maximizes Control Cabinet Density: The ultra-slim chassis housing consumes minimal real estate on standard 35mm DIN rails. This compressed layout enables panel builders to pack dozens of discrete timing logic loops into tight, high-density machine control enclosures without compromising ventilation clearance.

• Suppresses Inductive Switching Interferences: Internal opto-isolated suppression circuits shield the internal logic processor from high-frequency electromagnetic noise spikes during nearby contactor switching. This integrated suppression allows the unit to maintain its strict 0.5-to-10 second accuracy profile even when mounted adjacent to high-power motor starters.

FAQs

• What is the functional difference between the One-Shot and Watchdog operations on this relay?

  In One-Shot mode, a brief input pulse triggers the output contact to flip states immediately and hold for the set 0.5-to-10 second duration before returning, regardless of trailing input signals. In Watchdog mode, the internal timer expects a continuous series of regular input pulses from an external source (like a PLC run bit). If those pulses stop for longer than the set time window, the output relay drops out to trip an alarm or shut down downstream machinery.

• Does this model carry certifications for deployment inside explosive or hazardous environments?

  Yes. The "-EX" suffix indicates that Allen-Bradley builds this model with specific safety considerations, allowing deployment inside hazardous industrial locations. Ensure that the external enclosure provides the necessary protective atmosphere and IP protection rating mandated by localized ATEX or hazardous zone regulations before applying live power.

• How should technicians calibrate the precise timing delay window on this module?

  The front face of the 700-FSK3CU23-EX features graduated rotary dials that interface with high-resolution internal potentiometers. Technicians use a small terminal screwdriver to adjust the top range selection dial and the bottom fine-tuning scale until the indicator matches the target duration between 0.5 and 10 seconds.