Johnson Controls CSDSC-C50150L1 Self-Calibrating Current Switch Clamp 0.5A–150A with 24V Relay

The Johnson Controls CSDSC-C50150L1 is a self-calibrating, clamp-style current switch device designed to provide reliable verification of electrical equipment operation. Part of the CSDSC Series, this split-core current switch is well-suited for monitoring fans, pumps, and other motor-driven loads in commercial HVAC and building automation applications. The current range spans 0.50A to 150A, with a normally open (N.O.) relay option rated at 10A at 125 VAC powered by a 24V coil.

Key Features:

• Self-Calibrating Design: Uses a single-turn dial to select motor full load amps (FLA), eliminating the need for live calibration and reducing installation time compared to traditional current switches
• Current Range: 0.50A minimum turn-on to 150A maximum, covering a wide range of motor applications including sub-fractional HP motors
• Clamp / Split-Core Construction: Installs around a single conductor without cutting the wire, enabling faster and safer setup
• Safe De-Energized Installation: Designed to be installed when the panel is de-energized, eliminating the need for OSHA-required PPE when working with live panels
• Adjustable Setpoint Logic: Output closes when monitored current exceeds 70% of full load amps and opens when current falls below 60% FLA, allowing loss-of-load detection without additional calibration
• Optional N.O. Relay: Includes relay output rated at 10A at 125 VAC with 24V coil (L1 suffix)
• LED Status Indication: Onboard LED allows easy visual verification of switch on/off status
• Polarity Insensitive Output: Simplifies field wiring
• Self-Powered from Monitored Load: Operates without a separate power supply
• Uses Full Load Amps (Not Horsepower): Eliminates the need for voltage-specific part numbers across different line voltages

The CSDSC-C50150L1 is an ideal choice for building automation systems requiring dependable current-sensing feedback on HVAC fans, pumps, and other motor loads. Its self-calibrating clamp design minimizes commissioning time, while the 150A capacity and integrated relay make it versatile across a broad range of commercial applications.