VS94 Series Shock and Vibration Switch for Stationary Machinery Protection

The VS94 Series is a compact, field-proven shutdown device engineered for stationary industrial machinery where uncontrolled shock or vibration can lead to costly mechanical failure. Its robust magnetic latch mechanism, combined with micro-fine sensitivity adjustment and a sealed NEMA 4/4X polyester enclosure, makes it a reliable and easily configurable protection solution for pumps, compressors, cooling fans, and rotating equipment operating in non-hazardous locations. With optional remote reset and adjustable start-up time delay, the VS94 adapts to demanding operational requirements without compromising protection integrity.

• Three-Plane Shock and Vibration Detection: The VS94 monitors machinery for harmful shock and vibration simultaneously across all three axes of movement — vertical, horizontal, and lateral. This comprehensive sensing approach ensures that impact events or vibration anomalies from any direction are captured and acted upon, reducing the risk of undetected mechanical deterioration.
• Reliable Magnetic Latch Mechanism: An inertia mass held against a magnetic latch forms the core of the VS94's tripping system. During normal operation, the magnet firmly retains the latch arm. When vibration or shock levels surpass the set threshold, the resulting force displaces the inertia mass, separating the latch arm from the magnet and actuating the snap-switches for immediate shutdown. This design provides positive, decisive action with minimal risk of false tripping.
• Micro-Fine, Easy-to-Adjust Sensitivity: Sensitivity is calibrated by adjusting the air gap between the magnet and the latch arm plate — a precise, stepless method that allows fine-tuning to match the normal vibration baseline of each specific machine. This adjustment can be made in the field without specialist tools, enabling rapid commissioning and recalibration as operating conditions change.
• NEMA 4/4X Weatherproof Enclosure (IP66): The VS94 is housed in a glass-filled polyester enclosure rated NEMA 4/4X and IP66, providing robust protection against water ingress, dust, and corrosion. This makes it well-suited for outdoor industrial environments, wash-down areas, and coastal installations where enclosure integrity is critical to long-term reliability.
• Two Versatile SPDT Snap-Switches Rated to 480 VAC: The VS94 features two single-pole double-throw snap-action switches rated at 5A @ 480 VAC, 2A resistive, and 1A inductive up to 30 VDC. This dual-switch configuration provides the flexibility to simultaneously drive a shutdown circuit and trigger an alarm output — or to satisfy dual-channel safety interlock requirements.
• Optional Remote Reset: An available built-in electric solenoid allows operators to reset the VS94 from a safe, remote location following a trip event — eliminating the need for physical access to the switch after each shutdown. This is particularly valuable in installations where the switch is mounted in confined or hard-to-reach positions.
• Adjustable Start-Up Time Delay (Optional): The optional time delay circuit overrides the VS94's trip function during equipment start-up, preventing nuisance trips caused by the elevated vibration levels typical during machine run-up. The delay is field-adjustable via a 20-turn potentiometer from 5 seconds up to approximately 6.5 minutes, giving operators precise control over the start-up window.
• Optional Space Heater Circuit: A built-in space heater option prevents moisture condensation from forming inside the VS94 housing in humid or fluctuating-temperature environments. This preserves internal component integrity and ensures consistent switching performance even in challenging ambient conditions.