Time Relay FF PCU-504UNI with Power-Fail Memory 1NO/NC 12–264V

FF PCU-504UNI is a time relay with power-fail memory and a single changeover contact configurable as either normally open (NO) or normally closed (NC). It accepts a wide supply voltage range from 12 to 264 V, making it compatible with diverse industrial and commercial installations. The module preserves the timing state when supply is interrupted and resumes count or output state on restoration of power, supporting reliable operation in applications where continuity after power loss is required.

Advantages

The device’s power-fail memory prevents loss of timing information during supply interruptions, reducing the need for manual reset or reconfiguration. A wide input voltage range enables flexible installation across 12–264 V systems without additional converters. The single configurable changeover contact simplifies wiring and allows the relay to be used for either make-before-break or break-before-make functions as required.

Suitable for

• Industrial control panels and automation racks
• Lighting sequences and timed switching in commercial buildings
• Process timing where continuity after power interruption is essential
• Retrofit projects replacing fixed-function timers

Key specifications

• Operating voltage range: 12–264 V AC/DC
• Contact configuration: single changeover contact (configurable NO/NC)
• Power-fail memory: preserves timing state during supply loss and resumes on power restore
• Mounting: DIN-rail compatible form factor for panel installation
• Typical application environment: control cabinets, distribution boards, automation cabinets

How to use

Install the relay on a DIN rail inside an appropriate enclosure and connect supply lines according to system voltage. Configure the output contact for normally open or normally closed operation per application needs, and set the required timing parameters following the manufacturer’s front-panel or configuration instructions. During operation, the unit will maintain its timing state if power is interrupted and will continue from the stored state when power returns. Ensure protective measures such as appropriate fusing and proper grounding are in place before energising.

Usage recommendations

For reliable performance, mount the relay in a well-ventilated control cabinet away from sources of excessive heat or moisture, use correct supply voltage within the specified 12–264 V range, and verify wiring polarity for DC installations. Regularly inspect terminal connections and apply manufacturer-recommended surge protection in environments prone to voltage disturbances.