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Grey rectangular relay with octal base and eight pins

Macromatic

Macromatic PCPU Phase Monitor Relay 8 Pin 190-500V AC Octal Base SPDT 10A

SKU CH-4RDY-WMRY6

Monitors three-phase voltage from 190 to 500 V AC and switches 10 A loads via an 8-pin octal base

  • Product typeIndustrial Electrical Controls & Automation
  • Monitors phase reversal to protect three-phase equipment
  • Auto-restart after 1 sec reduces manual intervention
  • SPDT contacts rated 10 A at 277 V AC handle heavy loads
  • Wide 190–500 V AC input suits global power systems
  • Plug-in octal base enables quick panel mounting

Phase Monitor Relay for Three-Phase Protection

The Macromatic PCPU monitors phase reversal on three-phase lines from 190 to 500V AC. It mounts via an 8-pin octal base and carries a 10 A SPDT contact rated for 277V AC or 30V DC. Operating temperature reaches 149 Degrees F at 50/60 Hz.

Auto-Restart with One-Second Delay

The relay restarts automatically after a fault clears, using a fixed 1-second delay. This behaviour is built into the unit and requires no external timer or software configuration. The plug-in design allows quick replacement without rewiring the enclosure.

Suits Panels Needing Basic Phase-Loss Guarding

Installers protecting motors or pumps from phase reversal will find the voltage range and contact rating adequate. Buyers who need undervoltage, overvoltage or phase-loss detection should look at a more featured monitor. Those requiring DIN-rail mounting or programmable delays will need a different form factor.

How it compares

Measured against everything we stock in Electrical Enclosures & Cabinets, at today’s prices. Recalculated every night.

Price $45.99
Typical for this category: the median of 1,411 items is $39.99.

Specifications

Product
Brand nameMACROMATIC
Product typeIndustrial Electrical Controls & Automation

Questions about this item

How many switching cycles before the relay contacts typically need replacement?

The relay is rated for 100,000 electrical operating cycles at 10 A, 277 V AC or 7 A, 30 V DC.

What is the first thermal limit reached during continuous operation?

The maximum operating temperature is 149 °F; sustained loads near 10 A at 50/60 Hz will approach this limit first.

How much heat does the relay dissipate when running all day under full load?

At the rated 40 VA maximum switching capacity and 10 A continuous current, the coil and contacts generate heat that must stay within the 149 °F ambient limit.

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