Westinghouse 626458R Furnace Limit Switch 190F 2-pole

Product Description

The WESTINGHOUSE 626458R is a 2-pole furnace limit switch rated to 190 degrees F, designed for use in electric furnace applications. This limit switch serves as a critical safety component, interrupting the circuit when the furnace reaches its upper temperature threshold and resetting at 140 degrees F. The nickel construction and 3/4-inch diameter disc format make it suitable for the demanding thermal cycling conditions found in residential electric furnace installations. Licensed HVAC technicians install this component as part of routine safety-device servicing or when diagnosing an overheat fault condition.

The 626458R is specifically applied in B5BV Series electric furnaces where a 2-pole, 190-degree F limit switch is required. Its reset differential — opening at 190 degrees F and closing at 140 degrees F — provides a 50-degree F span that helps prevent nuisance tripping while still protecting the heat exchanger and surrounding components from damage due to sustained overtemperature conditions. This part is appropriate for service calls involving limit switch replacement, furnace lockout diagnosis, or scheduled safety-device inspection.

Key Features

• Opens at 190 degrees F, resets at 140 degrees F — 50-degree F differential
• 2-pole configuration interrupts multiple circuit legs simultaneously
• 3/4-inch diameter disc format for direct OEM-style fitment
• Nickel construction for thermal durability in high-cycle environments
• Designed as a safety cutout to protect electric furnace components from overtemperature damage

Compatibility

Designed for use with B5BV Series electric furnaces as an OEM-style limit switch replacement.

Installation Notes

A licensed HVAC technician should perform limit switch replacement. Disconnect and lock out all electrical power to the furnace before beginning service. Verify the new switch orientation and pole configuration match the original before securing and reconnecting wiring. After installation, cycle the furnace and confirm normal limit switch operation before returning the unit to service.

Technical Specifications

• Switch Type: Limit Switch
• Poles: 2
• Opening Temperature: 190 degrees F
• Reset Temperature: 140 degrees F
• Disc Diameter: 0.75 inches
• Material: Nickel
• Application: Electric Furnace

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 626458R