Johnson Controls KZ-4000-5 Relay

The Johnson Controls KZ-4000-5 is a heavy-duty general purpose relay engineered for high-demand switching in commercial HVACR and industrial automation systems. This 120 Vac relay features a Single Pole Double Throw (SPDT) contact configuration, providing the versatility required to manage two separate circuits from a single input source. When your sequence of operations requires switching large electrical loads from a lower-powered source, this unit delivers consistent performance with its 10 VA nominal coil rating and high-capacity 25 Amp resistive load handling.

Designed for professional-grade panel mounting, the KZ-4000 series utilizes self-wiping silver alloy contacts to minimize carbon buildup and maintain low contact resistance over extended cycles. This HVAC control relay is commonly deployed in furnace sequences, air conditioning control circuits, and complex building automation interfaces. The integral screw terminals facilitate secure field wiring, ensuring a stable connection that meets rigorous electrical code standards. For applications requiring additional environmental shielding, this relay is compatible with standard Johnson Controls enclosures.

• High Amperage Capacity: Rated for 25 Amp resistive loads (1 HP at 120 V), making it suitable for motor starting and heavy heating elements.
• Reliable SPDT Switching: Offers flexible Form C contact action for complex control system logic.
• Pro-Grade Contact Material: Self-wiping silver alloy contacts ensure clean breaks and long-term conductivity in 120V circuits.
• Efficient Coil Design: Low 10 VA power consumption allows for integration with various BAS controllers and pilots.
• Standardized Mounting: Engineered for easy panel installation in a wide range of industrial electrical cabinets.

Common Questions:

What is the maximum amperage rating for the KZ-4000-5?
This relay is rated for 25 Amps resistive or 1 HP (746 watts) at 120 Vac, allowing it to handle substantial electrical loads in HVAC applications.

Does this unit include a protective enclosure?
The KZ-4000-5 is a general-purpose model designed for panel mounting; if a separate enclosure is required for your specific installation, the BZ-1000-11 is the recommended compatible housing.

Can this relay be used for 240V circuits?
While the contacts are rated for 240V, the coil on the KZ-4000-5 is specifically designed for 120 Vac operation. For 240V coil applications, you would typically reference the KZ-4000-6 model.

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.