Overview
The Robertshaw 365-A8 Vibraswitch is a mechanical vibration malfunction detector engineered for continuous monitoring of industrial rotating and reciprocating equipment. This vibration switch provides protection for large motors, pumps, compressors, and other rotating equipment by alerting the user to excess vibration. Failing bearings, bent shafts, broken blades, over-speeding and similar malfunctions cause increased imbalance or high frequency vibration detectable with the model 365A vibration switch.
Key Features
- Acceleration-sensitive technology — Measures destructive forces on equipment to prevent costly downtime
- Weatherproof enclosure — NEMA Type 4 specifications for general-purpose industrial installations
- Low maintenance design — No moving parts except at trip level; no attention required after installation
- Remote reset capability — Remote electrical or manual reset at unit with reset coil options
- Flexible wiring — Can be wired to actuate an alarm or cause a shutdown before costly damage occurs
Technical Specifications
- Vibration Range: 0–4.5 g’s (peak, horizontal)
- Contact Configuration: SPDT (Single Pole Double Throw)
- Contact Rating: 7A max @ 460 VAC (non-inductive); 0.5A @ 120 VDC; 1A @ 48 VDC; 2A @ 24 VDC
- Reset Coil: 120 volts AC
- Enclosure Rating: NEMA Type 4 weatherproof housing
- Housing Material: Cast aluminum
- Frequency Range: ±5% accuracy at frequencies up to 300 Hz
- Certifications: CSA Certified and FM approved
Typical Applications
The 365-A8 is commonly used in:
- Large electric motor protection and condition monitoring
- Pump and compressor vibration supervision
- Industrial fan and blower systems
- Rotating equipment in critical production environments
- Predictive maintenance and early fault detection
- Integration with alarm systems and automated shutdown controls
Compatibility & Replacements
Compatible With
- Industrial control systems and PLC-based automation
- Manual alarm and shutdown circuits
- Remote electrical reset controls
- Motor protection relay systems
Replaces / Drop-In Replacement For
- Robertshaw 365A-A8 (same electrical ratings, SPDT contact configuration)
- Other Robertshaw 365-series models with equivalent specifications
- Verify compatibility with your system integrator before ordering.
Works With
- AC and DC control circuits (up to 460 VAC / 120 VDC ratings)
- 24 VDC, 48 VDC, and 120 VDC industrial control voltage systems
- Electromagnetic relay starters and contactors
- Manual and remote electrical reset mechanisms
