Current Monitoring Relays


Marsh Bellofram current monitoring relays, available in multiple styles and types, are designed to detect AC and DC over and under current conditions, effectively detecting and preventing electrical shorts conditions and motor jam-ups which can damage equipment and significantly hamper its longer-term performance.


CBA Series AC Current Band Monitoring Relay

CBA Series AC Current Band Monitoring Relay

The CBA Series AC Current Band Monitoring Relay from the ATC Diversified Electronics division of Marsh Bellofram is used to detect both under and over current conditions which could have a potentially negative effect on the continuous operation of motors, […]

CDD Series Universal DC Current Monitoring Relay

CDD Series Universal DC Current Monitoring Relay

The CDD Series Universal DC Current Monitoring Relay from the ATC Diversified Electronics division of Marsh Bellofram is used to detect both DC under and over current conditions which could have a potentially negative effect on the continuous operation of […]

CDO Series DC Over Current Monitor

CDO Series DC Over Current Monitor

The CDO Series DC Over Current Monitor from the ATC Diversified Electronics division of Marsh Bellofram is used to detect both DC over current conditions which could have a potentially negative effect on the continuous operation of motors, pumps or […]

CMB Series AC Go/No-Go Current Monitoring Relay

CMB Series AC Go/No-Go Current Monitoring Relay

The CMB Series AC Go/No-Go Current Monitoring Relay from the ATC Diversified Electronics division of Marsh Bellofram is designed to detect the presence and level of AC current, ensuring consistent levels for the continuous operation of motors, pumps or other […]

CMC Series AC Over Current Monitor with Reversing Relay

CMC Series AC Over Current Monitor with Reversing Relay

The CMC series AC over current monitor with reversing relay and fault detector counter from the ATC Diversified Electronics division of Marsh Bellofram is designed to detect a motor jam, providing the equipment with an opportunity to self-clear before going […]

CMO Series AC Over Current Monitoring Relay

CMO Series AC Over Current Monitoring Relay

The CMO Series AC Over Current Monitoring Relay from the ATC Diversified Electronics division of Marsh Bellofram is an AC over current monitoring relay with adjustable time delay, designed to prevent damage and premature equipment failure in pumps, motors and […]

CMU Series AC Under Current Monitor

CMU Series AC Under Current Monitor

The CMU Series AC Under Current Monitor from the ATC Diversified Electronics division of Marsh Bellofram is an AC under current monitoring relay with adjustable time delay, designed to prevent damage and premature equipment failure in pumps, motors and other […]

CDU Series DC Current Monitor Relays

CDU Series DC Current Monitor Relays

CDU Series DC current monitor relays from the ATC Diversified Electronics division of Marsh Bellofram is used to detect UNDER CURRENT conditions. The internal relay is energized (Pick-up) when the monitored current is above the preset trip point. The relay […]

CLB Series Three-Phase Current Unbalance and Over Current Monitor

CLB Series Three-Phase Current Unbalance and Over Current Monitor

The CLB Series Three-Phase Current Unbalance and Over Current Monitor from the ATC Diversified Electronics division of Marsh Bellofram is used to protect three phase equipment against CURRENT UNBALANCE and OVER CURRENT conditions. The control voltage is continuously applied to […]

CMD Series AC Universal Current Monitor

CMD Series AC Universal Current Monitor

The CMD Series AC Universal Current Monitor from the ATC Diversified Electronics division of Marsh Bellofram may be used as an OVER CURRENT Monitor or an UNDER CURRENT Monitor.

CMI Series AC Over Current Monitor

CMI Series AC Over Current Monitor

The CMI Series AC Over Current Monitor Relay from the ATC Diversified Electronics division of Marsh Bellofram operates in the FAILSAFE MODEL as the relay is energized (pick-up) when the monitored AC current is normal. The relay de-energizes (Drop-out) when […]

CML Series AC Over Current Monitor

CML Series AC Over Current Monitor

The CML Series AC Over Current Monitor from the ATC Diversified Electronics division of Marsh Bellofram is used to detect OVER CURRENT conditions. The internal relay energizes (Pick-up) when the monitored current exceeds the preset trip point for longer than […]

AC-410 Series Phase Sequence Loss Monitor

AC-410 Series Phase Sequence Loss Monitor

The AC-410 Series Phase Sequence Loss Monitor from the ATC Diversified Electronics division of Marsh Bellofram are plug in Phase Sequence and Loss Monitors that protect 3 phase refrigeration equipment from adverse line conditions such as: PHASE LOSS (SINGLE PHASING): […]