Veris Industries H-548NS Relay

As an experienced technician, you know that simplifying your control strings is the best way to ensure long-term reliability in the field. The Veris Industries H-548NS Relay is a specialized solid-core current sensing relay designed specifically for HVAC motor status monitoring and direct load control. This unit consolidates a high-performance command relay and an adjustable current switch into a single compact housing, effectively replacing the need for multiple discrete components when managing fractional horsepower motors. With a flexible adjustable Trip Point range of 0.5 to 15 Amps, the H-548NS allows for precise calibration, ensuring that your Building Automation System (BAS) receives an accurate "Proof of Flow" signal for pumps, fans, and compressors.

The integrated SPST relay is field-selectable for Normally Open (N.O.) or Normally Closed (N.C.) operation, providing the versatility required for various commercial HVAC control sequences. Its 24VAC/VDC relay coil is compatible with standard industry controllers, and the status output is rated for 1A at 30VAC/DC. Designed for durability, the solid-core current sensor provides induced power from the monitored conductor, eliminating the need for an external power supply for the sensing side. Whether you are mounting it directly to a junction box or inside a starter enclosure, the H-548NS delivers a streamlined solution for fractional HP motor control and real-time status feedback.

• Streamlined Installation: Combines a sensing switch and a command relay in one device, reducing wiring time and enclosure clutter.
• Precise Calibration: Features an adjustable amperage range (0.5-15A) to match the specific load profiles of your equipment.
• Universal Compatibility: Works seamlessly with Building Automation Systems using standard 24V control signals.
• Visual Diagnostics: Includes onboard LED indicators for both relay power and status, making on-site troubleshooting faster and more intuitive.
• Flexible Mounting: Can be mounted to a 2 or 4-gang junction box, nippled to a panel, or used as a standalone device.

Can the H-548NS be used to monitor variable frequency drives (VFDs)?
This relay is optimized for 50/60 Hz applications. For monitoring motors downstream of a VFD, ensure the operating frequency stays within that range, or consider specialized sensors designed for variable frequency output.

What is the maximum torque for terminal connections?
To maintain a safe electrical connection, tighten the relay control terminals to 3.5 in-lb and all other status/line terminals to 12 in-lb to ensure proper conductor retention.

How do I calibrate the trip point?
With the motor running at normal load, turn the adjustment screw until the status LED changes state. This provides a reliable "on" signal only when the load is actually present, not just when the starter is energized.

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.