Honeywell MCS-NO-A-50A Switch

The Honeywell MCS-NO-A-50A is a commercial-grade solid core current switch designed for precision monitoring in building automation and HVACR systems. Built for the field technician, this unit features a wide 0.75-50A adjustable trip point, allowing you to calibrate the switch to the specific Full Load Amps (FLA) of the equipment being monitored. The normally open (N/O) solid-state output provides reliable digital feedback to a controller, signaling when a motor, fan, or pump has reached the desired amperage threshold. Utilizing a solid-core design, this adjustable current sensor ensures high accuracy and long-term stability by maintaining a fixed physical connection around the conductor. By integrating this Honeywell current status switch into your control loops, you gain verified proof of operation for induction motors, ensuring that your BAS logic can detect belt breaks, coupling failures, or motor stalls without relying on inaccurate voltage-based sensing.

• Field-Adjustable Trip Points: The 0.75-50A adjustable trip point range allows a single SKU to cover various motor sizes, reducing the amount of truck stock needed for maintenance calls.
• Enhanced Monitoring Accuracy: Offers a more reliable signal than differential pressure switches, especially in variable frequency drive (VFD) or belt-driven fan applications.
• Industrial Durability: Features a solid core current switch architecture that provides consistent induction performance and resists the mechanical wear of high-vibration environments.
• Simplified Wiring: The normally open output functions like a dry contact, making it compatible with most DDC, PLC, and building automation controllers.
• Compliance and Safety: Meets rigorous standards for commercial installs, ensuring performance in high-amperage industrial applications.

Can the Honeywell MCS-NO-A-50A be used with VFDs?
Yes, current switches like the Honeywell MCS-NO-A-50A are commonly used with variable frequency drives. However, for maximum accuracy, ensure the switch is installed on the line side of the drive or calibrated at the drive's minimum operating frequency.

What is the benefit of a solid core over a split core?
A solid core current sensor is generally more cost-effective and provides better long-term reliability in environments where the conductor does not need to be frequently removed. It eliminates the potential for core misalignment that can occur with split-core models.

How do I set the trip point on this model?
Using a multi-turn potentiometer, you can adjust the sensitivity so the current status switch closes only when the motor is under load, allowing you to filter out phantom current or idling motors.

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.