Current Sensing Relays

Macromatic offers a wide variety of AC & DC current sensing relays (sometimes referred to as current monitor relays). They be used in several applications where protection of sensitive or expensive equipment against over or under current conditions is required, such as detecting (sensing) conveyor jam-up conditions, machine tool wear, no load conditions or monitoring status of heater or lamp loads. An external current transformer may be used to extend the range of these products (for more information, read our KnowledgeBase Article).

Choose the type of mounting configuration required for your application and then select from a variety of functions, time delay settings, and output configurations:


Used with  8 or 11 pin octal sockets. Allows for easy replacement without having to remove any control wiring. Macromatic sockets can either be mounted on 35mm DIN track or to the panel with two screws. All Macromatic plug-in time delay relays are UL Listed for use in both United States and Canada (cULus) when used with the appropriate Macromatic socket as well as Component Recognized (cURus) using any recognized socket. 

CAP Series: Detects AC or DC overcurrent condition, 11 pin octal socket

COKP Series: Detects AC overcurrent condition, 8 pin octal socket



These products have an encapsulated construction for protection against harsh environments. They are easy to mount with two screws and use 0.25" quick-connect terminations for easy wiring. All Macromatic encapsulated current sensing relays are UL Component Recognized.

CAH Series: Detects either an overcurrent or undercurrent condition

COH Series: Detects overcurrent condition only

CUH Series: Detects undercurrent condition only


Current Sensing Relay | Current Monitor Relay




Current Sensing Relay | Current Monitor Relay



Use this tool to build your catalog number by selecting features and options for a base product from this family.

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Macromatic's Current Sensing Relays Knowledge Base contains general and technical industry articles to help you learn more about Current Sensing Relays.

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