Veris Industries H-938 Switch

The Veris Industries H-938 is a high-performance split-core current switch and integrated command relay combo designed to streamline motor control and status monitoring in high-demand HVACR environments. Engineered for the professional contractor, this device eliminates the need for redundant components by housing an adjustable set-point current sensor and a 24VAC/VDC SPST relay in a single unit. With a monitored current range of 2.5 to 135A and a 10A rated mechanical relay, the H-938 is built to withstand the rigors of starting and stopping fan or pump motors while providing instantaneous feedback on status. The split-core design allows for rapid retrofitting without disconnecting conductors, while the multi-configuration bracket ensures a clean fit in tight starter enclosures. By utilizing this current monitoring switch, you can accurately detect belt loss or motor failure, ensuring critical system reliability through precise building automation integration.

• Reduced Installation Costs: Consolidates split-core status sensing and command relay functions into one footprint, saving rail space and labor.
• Adjustable Trip Point: Features a high-resolution 20-turn potentiometer for fine-tuning the 2.5–135A range to match specific motor loads.
• Inductive Load Monitoring: Ideal for detecting belt slippage, coupling shear, or mechanical failure in centrifugal fans and pumps.
• Simplified Wiring: Polarity-insensitive status outputs and onboard LEDs for relay power and switch status facilitate meter-free calibration.

How do I calibrate the H-938 for belt loss detection?
With the motor running under normal load, turn the adjustment potentiometer clockwise until the status LED turns off. Then, slowly turn it counter-clockwise until the LED illuminates. This sets the threshold just below the operating current to trigger on load reduction.

Does the unit require external power for the sensor?
No, the current switch is induced directly from the monitored conductor. However, the command relay requires a 24VAC/VDC external supply for coil operation.

Can the H-938 handle high-amperage startup surges?
The sensor is designed for conductors up to 135A. For motors exceeding this range, additional loops through the iris or an external CT may be required, though most standard HVAC pump and fan applications fall within its native parameters.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.