Baltimore Aircoil (BAC) 312178 Vibration Switch

The Baltimore Aircoil (BAC) 312178 Vibration Switch is a critical safety component designed for high-performance cooling towers and industrial HVAC systems. As the direct replacement for 311788, this mechanical VCOS vibration switch provides essential protection by detecting excessive mechanical oscillation and initiating an immediate system shutdown to prevent catastrophic motor or fan failure. Engineered for rugged environments, it features a NEMA 4X and IP66 rated enclosure, ensuring complete protection against dust ingress, corrosion, and high-pressure water jets.

This BAC maintenance part is rated for 480VAC/250VDC at 10 Amps, making it compatible with a wide range of industrial power configurations. The local reset only design ensures that a technician must physically inspect the equipment after a trip, adhering to strict safety protocols. Whether you are servicing Baltimore Aircoil cooling towers or large-scale industrial blowers, the 312178 ensures operational reliability and equipment longevity by mitigating risks associated with unbalanced loads or bearing wear.

• Direct OEM Replacement: Replaces legacy part number 311788 without requiring modification to mounting brackets or wiring layouts.
• Harsh Environment Ready: The IP66/NEMA 4X housing is purpose-built for the high-humidity and chemically treated environments found in cooling tower plumes.
• Universal Compatibility: High contact ratings of 480 VAC and 10 Amps allow for seamless integration into most motor control center (MCC) safety loops.
• Manual Safety Check: Local reset functionality mandates a manual inspection of the mechanical drive train before restarting the system.
• Enhanced Equipment Protection: Early detection of excessive vibration prevents secondary damage to shafts, bearings, and fan blades.

Is the BAC 312178 compatible with other cooling tower brands?
While specifically engineered for Baltimore Aircoil (BAC) units, this mechanical vibration switch can be utilized in various industrial fan and blower applications provided the 480VAC/10A electrical ratings and NEMA 4X mounting requirements are met.

What is the difference between the 312178 and the older 311788?
The 312178 vibration switch is the current manufacturer-recommended direct replacement for 311788, offering updated enclosure sealing standards while maintaining the same electrical specifications and mechanical trip sensitivity.

Can I reset this switch remotely from the VFD or BAS?
No. For safety compliance, this unit features a local reset only mechanism. This ensures HVAC contractors or on-site engineers perform a physical vibration analysis or visual inspection before returning the equipment to service.

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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.