Veris Industries H-934 Current Switch

The Veris Industries H-934 (also referred to as H934) is a microprocessor-based split-core current switch engineered specifically for technical professionals managing Variable Frequency Drive (VFD) applications. This device operates by storing sensed amperage values across various frequency ranges in non-volatile memory, allowing it to accurately distinguish between normal amp drops due to speed modulation and critical mechanical failures. For an HVACR technician, this means reliable belt loss detection and coupling shear monitoring without the nuisance trips common in non-microprocessor sensors. The H-934 features a 3.5 to 135A amperage range and automatic calibration, which significantly reduces lab time in live starter enclosures. By combining a current switch and command relay into a single footprint, this unit simplifies start/stop motor control and status feedback for building automation systems. The induced-power design eliminates the need for external power supplies at the sensor, while the SPST relay provides isolated control rated for 5A at 250VAC.

• VFD Compatibility: Microprocessor-controlled logic compensates for frequency changes from 20 to 75Hz to prevent false alarms during normal ramping.
• Labor Savings: The self-calibrating trip point allows for "install and go" functionality, removing the need for manual adjustment in energized cabinets.
• Integrated Control: Combines a digital current sensor with a 5A normally open relay, saving valuable rail space and reducing wiring complexity.
• Split-Core Design: Facilitates easy retrofitting onto existing conductors without disconnecting high-voltage lines, maintaining a safe and efficient installation.
• High Reliability: Industry-standard solution for monitoring positive fan and pump status in complex HVACR environments.

• How does the H-934 handle belt loss on a motor running at low speeds? The onboard microprocessor tracks the relationship between frequency and amperage. If the current drops below the memorized threshold for a specific frequency, the switch triggers an alarm, accurately identifying a load loss even when the drive is modulated.
• Is this sensor compatible with all VFD brands? Yes, the Veris Hawkeye 934 is designed to be brand-agnostic, sensing the magnetic field directly from the conductor on the load side of any standard drive.
• What is the minimum current required for the switch to operate? The standard trip point begins at 3.5 Amps. For smaller loads, you can loop the conductor through the split-core sensor window multiple times to increase the sensed amperage.

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.