Indeeco 101-B3-600-50 Outdoor Slave

As a veteran tech, you know that managing high-capacity resistive loads in exposed environments requires hardware that doesn't quit. The Indeeco 101-B3-600-50 is a heavy-duty SCR 50A Outdoor Slave unit engineered for precise proportional control in demanding HVACR applications. Built as a 3-phase SCR power controller, this zero-cross fired assembly eliminates RFI noise while switching line voltages up to 600VAC. Designed to function in a master-slave configuration, it accepts a pulsed 4-32VDC input signal from a 101 Series Model A master or compatible digital thermostat to modulate electric heating elements with a 1-second time base. Its unique thermal design allows the isolated heatsink to be mounted externally, keeping internal control cabinet temperatures low while the 50 amp SCR handles the heavy lifting. Whether you are scaling a duct heater array or balancing industrial process heat, this solid-state relay assembly provides the linear 0-100% output required for tight setpoint maintenance.

• High-Capacity Switching: Rated for up to 600VAC and 50A, making it ideal for large-scale 3-phase resistive loads.
• Superior Thermal Management: Features an electrically isolated heatsink designed for through-panel mounting to dissipate heat outside the enclosure.
• Zero-Cross Firing: Minimizes electrical noise and harmonic distortion, ensuring compatibility with sensitive electronic equipment on-site.
• Rugged Outdoor Build: Specifically engineered for weatherproof integration, maintaining reliable operation in extreme ambient temperatures.
• Seamless Integration: Pairs with Model A Master controllers to expand system capacity without needing additional complex control signals.

Common Questions

Can this unit operate without a Master controller?
No, the 101-B3-600-50 is a slave SCR unit and does not have an onboard input board. It requires a pulsed DC signal from a Master SCR controller or a compatible 24VDC pulse-width modulation source to function.

What is the benefit of the zero-cross firing mode?
Zero-cross firing ensures the SCR only switches when the AC voltage is at the zero-point. This prevents the high-frequency interference (RMI/RFI) common with phase-angle fired units, protecting your HVAC control systems from signal degradation.

How do I mount the heatsink for maximum efficiency?
For best performance, use the through-panel mounting method. This places the thermal heatsink outside the electrical cabinet, allowing ambient airflow to cool the solid-state relays while keeping your internal wires and components within their rated operating range.

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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.