Johnson Controls R310AE-2 Sensing Switch

The Johnson Controls R310AE-2 is a high-performance current sensing switch designed for HVACR professionals who need reliable interlocking and status monitoring without direct electrical connection to the sensed circuit. This solid-state current status switch operates with a normally open configuration, closing its internal electronic switch whenever the alternating current in the monitored conductor exceeds the 0.5-ampere threshold. This model is specifically engineered for high-voltage control circuits, making it the standard choice for interfacing with PENN P28 and P45 electromechanical lube oil controls.

As a veteran technician, you know that nuisance lockouts caused by compressor motor overloads are a constant headache. The R310AE-2, which is technically identical to the R310AE-2C, eliminates this by de-energizing the time delay heater on the oil cutout control as soon as current flow drops. Its compact NEMA-1 form factor allows for seamless mounting inside motor starters or contactor enclosures, and the 0.70-inch sensor hole easily accommodates heavy-gauge wiring or multiple turns for low-amperage detection. With a sensing range up to 200 amps and a switching capacity of 0-250 Vac/Vdc, it is a versatile tool for ensuring system protection and operational feedback across various motor-driven applications.

• Eliminates Nuisance Tripping: By sensing actual motor current, it prevents false lube oil lockouts during internal overload cycles.
• High-Voltage Compatibility: Optimized for 120/240V pilot circuits and integration with electromechanical time delay heaters.
• Zero Maintenance Design: The solid-state construction features no moving parts, ensuring consistent performance in demanding high-vibration equipment.
• Simplified Installation: The non-polarity sensitive output and included bracket allow for fast field retrofits or new builds.
• Inductive Powering: No external power supply is required for the sensor; it draws operational energy directly from the monitored line.

• Is the R310AE-2 interchangeable with the R310AE-2C? Yes, both part numbers represent the same technical specifications and are used interchangeably in most manufacturer catalogs.
• Can I use this switch for low-voltage P445 electronic controls? While it can handle various voltages, the R310AD-1 is typically preferred for low-voltage applications, whereas the R310AE-2 is the technician's choice for high-voltage (120/240V) heater circuits.
• What is the maximum current this sensor can handle? The sensor hole can accommodate conductors with up to a 200-amp continuous draw while maintaining accurate switching status.

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.