Current Monitor Relay H540

Features

  • Remote mounted current status sensor and command relay with HOA switch
  • Combines status sensor, command relay and HOA switch in a single series circuit one line connection for three devices
  • Gang box mounting – mounts directly onto gang box, flush to existing enclosures and standalone
  • HOA provides true relay control ideal for troubleshooting control wiring
  • SPST relay is field-selectable for NO or NC operation
  • All models rated up to 1 hp at 120 VAC one product for all fractional HP motor control and status applications
  • Induced from monitored conductor sensor power
  • Relay power LED
Enquiry
Category:
Love0

Dpstar offers a compact and integrated current monitor relay solution designed for industrial and commercial HVAC applications. Built for reliability and ease of installation, this unit combines a current relay, sensor, and HOA (hand-off-auto) switch in one enclosure—ideal for monitoring and managing fractional horsepower motor circuits.

Installed in series between the power source and motor, the relay simplifies wiring and enhances control by unifying all key components into a single circuit. The rugged housing provides physical separation between high- and low-voltage paths, with multiple wiring exits for flexible setup. Compatible with 2- or 4-gang junction boxes, or can be mounted stand-alone or in field enclosures.

Dimensional Drawing

Wiring Diagram

Applications

  • Monitoring status and controlling small motor loads that are not driven by a motor starter or contactor
  • Exhaust fans
  • Unit ventilators
  • Fan terminal units
  • Fan coil units
  • Recirculating pumps

Specification

Model H540
Application Building Automation Systems
Current Measurement Range  0.25 – 15 A
Current Sensor type Current Transducer, AC, with Relay
Electrical Wiring Size  24 – 14 AWG (0.2 – 2.1 mm²)
Hand-Off-Auto  Yes
Measurement Type  AC Current
Monitored Wire Size 50 – 60 Hz
Mounting 4 x 4 Box
Operating Humidity 10 – 90% RH, non-condensing
Operating Temperature 5 – 122 °F (-15 – 50 °C)
Output Specifications N.O. 1 A @ 30 VAC/DC
Outputs Switch output | Relay
Product Certification UL
Product Type Sensor
Range Motor Control Series
Relay Coil Voltage 24 VAC/DC
Mechanical
Relay Contact Ratings Resistive: 15 A @ 277 VAC | Motor: 1 H.P. @ 120 VAC
Relay Poles/Throw SPST
Setpoint  Fixed
Warranty 5 years

Ordering Information

Related products