Schneider Electric (Barber Colman) AM-321 Auxiliary Switch

The Schneider Electric AM-321 is a precision-engineered 2 SPDT auxiliary switch designed to provide reliable position feedback and sequence control for HVAC actuators. Functioning as the AM-322 direct replacement, this unit is built for seamless integration with legacy Barber Colman and modern Schneider Electric actuator assemblies. The assembly features dual Single Pole Double Throw contacts with an adjustable differential, allowing field technicians to fine-tune the switching points across the full stroke of the actuator. This Barber Colman auxiliary switch is critical for interlocking auxiliary equipment such as fans, pumps, or boilers based on damper or valve position. The AM-321 actuator switch simplifies end-switch signaling by providing dry contact outputs that are highly durable and capable of handling standard control voltages. Its mechanical design ensures long-term calibration stability, making it the preferred choice for contractors managing retrofit HVAC controls or performing critical maintenance on industrial air handling units.

Key Benefits

• Dual SPDT Switches: Provides two independent sets of contacts for versatile control of secondary HVAC components.
• Direct Retrofit Compatibility: Engineered to replace the discontinued AM-322 without requiring extensive mechanical modifications.
• Adjustable Differential: Offers field-adjustable trip points for precise synchronization with mechanical linkages.
• High-Reliability Contacts: Designed for consistent performance in high-cycle commercial plant environments.

Common Questions

Is the AM-321 compatible with MP-series actuators?
Yes, the AM-321 is designed to mount directly to many Schneider and Barber Colman gear-train actuators; verify your specific model's mounting plate before installation.

How does the AM-321 differ from the AM-322?
The AM-321 is the current production standard and serves as a direct functional and mechanical substitute for the older AM-322 model.

Can the switch differential be set independently for each SPDT contact?
The unit allows for specific timing adjustments to ensure the auxiliary signal matches the required sequence of operations.

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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.