Auto Limit Switch, 100°F – 140°F | NBK-21054

NBK-21054 – Auto Limit Switch, 100°F – 140°F – Special Order

The NBK-21054 Auto Limit Switch is designed to provide critical high-limit temperature control for greenhouse heating applications and other HVAC systems. This switch helps protect your equipment by automatically interrupting power if temperatures exceed safe operating levels, ensuring both safety and optimal performance. It is preset to close at approximately 100°F and open at 140°F, making it suitable for a range of climate control systems.

⚠️ SPECIAL ORDER NOTICE: This is a special order item sourced from NBK, requiring 1–2 extra business days for processing.

Key Features:
✅ Temperature-Sensitive Protection: Automatically stops heating components if temperatures rise above 140°F
✅ Restores Operation on Cool Down: Closes circuit again at approximately 100°F, resuming safe operation
✅ Direct OEM-Equivalent Replacement: Designed to match original manufacturer specifications for straightforward replacement
✅ Heavy-Duty Construction: Built to handle demanding greenhouse and HVAC environments

Specifications:
📌 SKU: 21054
📌 Category: Greenhouse / Auto Limit Switch
📌 Description: NBK-21054 Auto Limit Switch, 100°F – 140°F
📌 Temperature Range: Opens at 140°F, closes at 100°F
📌 Equivalent To:

• Modine 4034120

• Modine 5H0735930000

• Modine 5H73593

• Modine 5H71958

Why Choose This Replacement:
Ensure your greenhouse heater or HVAC system operates safely by installing this reliable auto limit switch, preventing overheating and potential damage.

Shipping & Availability:
This product is a special order item from NBK, typically adding 1–2 business days to standard order processing times.