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Marsh Bellofram Diversified Electronics Division CMU Series AC Under Current Monitor

Marsh Bellofram Diversified Electronics Division CMU Series AC Under Current Monitor

Product catalog summary

Overview: The CMU Series is designed to detect undercurrent conditions. It features an internal relay that energizes when the monitored current exceeds a preset trip point and de-energizes when the current falls below this point for longer than an adjustable delay, preventing nuisance tripping from momentary line dips. The relay re-energizes when the current rises 5% above the drop-out trip point for more than 0.1 seconds and includes an automatic reset feature. An external current transformer (CT) can extend the monitor's range.

Specifications:

Control Voltage: 24 or 120 VAC/DC; 50/60 Hz
Trip Points: Pick-up is 5% above Drop-out
Output: DPDT, 10 Amp @ 120 VAC Resistive
Hysteresis: 5%
Response Time: Operate in 0.1 seconds; Release adjustable from 0.1 to 5 seconds
Indicators: Glows when current is above preset trip point (Style E Enclosure only)
Reset: Automatic
Temperature Rating: Operate from 32° to 131°F (0° to +55°C); Storage from -49° to 185°F (-45° to +85°C)
Enclosure: Style A with Lexan Dust Cover and 11-Pin Plug-in; Style E with Lexan Surface Mounted and #8-32 Screw Terminals
Socket: RB-11 Socket for Style A
Weight: Style A is 5 oz.; Style E is 10.5 oz.

Operation: The CMU Series operates by monitoring current levels and adjusting relay states based on preset trip points and response times.

Dimensions: Specific dimensions are provided in inches for installation and setup.

Model Number Configuration: The model number includes control voltage, type of control voltage, enclosure style, and pick-up current range, with options for different current ranges and maximum continuous amps.

Wiring: Detailed wiring instructions are provided to ensure proper installation and operation.

Catalog excerpts

Marsh Bellofram Diversified Electronics Division CMU Series AC Under Current Monitor-1

CMU Series Diversified Electronics atcdiversified.com 800.727.5646 246 Current Monitors // CMU Series The CMU Series 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 de-energizes (Drop-out) when the current falls below the trip point for longer than the adjustable delay. The delay is incorporated to prevent nuisance tripping caused by momentary line dips. The relay re-energizes when the current rises 5% above the Dropout trip point for longer than 0.1 seconds. The relay has the automatic reset feature. An external CT may be used to extend the range of the Current Monitor. A C U n d e r Cu r r e n t Mo n i t o r \\\SPECIFICATIONS CONTROL VOLTAGE 24 or 120 VAC/DC; 50/60 Hz TRIP POINTS Pick-up 5% above Drop-out Drop-out See order information OUTPUT DPDT, 10 Amp @ 120 VAC Resistive HYSTERESIS 5% RESPONSE TIME Operate 0.1 SEC Release 0.1 to 5 SEC, Adjustable INDICATORS Glows When Current is Above Preset Current Trip Point (Style E Enclosure Only) RESET Automatic TEMPERATURE RATING Operate 32° to 131°F (0° to +55°C) Storage -49° to 185°F (-45° to +85°C) ENCLOSURE Style A Lexan Dust Cover; 11-Pin Plug-in Style E Lexan Surface Mounted: #8-32 Screw Terminals SOCKET RB-11 Socket for Style A. WEIGHT Style A 5 oz. Style E 10.5 oz. \\\OPERATION \\\DIMENSIONS (INCHES) MODEL NUMBER >>>>>> CMU S Control Voltage 24 A A .25 24 Volts 120 Volts 120 Type of Control Voltage AC DC D Enclosure Style Plug-In Surface Mount E Pick-Up Current Range 0.05 to 0.25 amps. adj. max continuous 3.4 amps 0.2 to 1 amps. adj. max continuous 11.9 amps 1 1.0 to 5.0 amps. adj. max continuous 13.4 amps 5 2.0 to 10 amps. adj. max continuous 25 amps 10 4.0 to 20 amps. adj. max continuous 25 amps 20 \\\WIRING 0.1 Sec.

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