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

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

The NBK-21054 Auto Limit Switch provides essential high-limit temperature protection for greenhouse heaters and HVAC systems. It safeguards your equipment by automatically interrupting power when temperatures exceed safe thresholds, preventing overheating and system damage. The switch resets once temperatures drop back into the safe range, ensuring reliable automatic temperature control between 100°F (close) and 140°F (open).

Key Features:
• Temperature-Sensitive Protection: Opens at 140°F to stop heating components and prevent overheating
• Automatic Reset: Closes again at approximately 100°F for safe and continuous operation
• OEM-Equivalent Replacement: Direct fit and function replacement for original manufacturer specifications
• Durable Construction: Engineered for the demanding environments of greenhouse and HVAC applications

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:
Protect your greenhouse or HVAC system with this dependable auto limit switch. It ensures your heating components operate within safe temperature limits, reducing risk of overheating and extending system life.