46086402 FIELD CONTROLS GSK-4 MV/24V 200°F MANUAL RESET GAS SPILL SWITCH
Product Overview
The Field Controls 46086402 GSK-4 Thermal Safety Switch is a manual reset gas spill switch designed to protect residential and light commercial gas-fired equipment. It is commonly used on gas furnaces, boilers, and water heaters, especially in sidewall venting applications, to detect flue gas spillage and shut down the appliance before unsafe conditions develop.
This normally closed SPST switch opens at 200°F and requires manual reset after activation. Featuring gold contacts for reliable low-voltage performance, the GSK-4 supports millivolt and 24 VAC systems. A TCA-1 thermocouple adapter is required for 30 millivolt applications.
✅ Key Features
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Manual reset thermal safety (gas spill) switch
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Opens at 200°F to shut down equipment during venting failures
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Normally closed (NC) switch
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Supports millivolt and 24 VAC systems
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Gold contact material for dependable low-voltage operation
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Ideal for sidewall venting applications
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Designed for furnaces, boilers, and water heaters
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Direct replacement for GSK-3
📋 Specifications
| Specification | Details |
|---|
| Manufacturer |
Field Controls |
| Part Number |
46086402 |
| Model |
GSK-4 |
| Switch Type |
SPST |
| Contact Type |
Normally Closed |
| Trip Temperature |
200°F |
| Reset Type |
Manual Reset |
| Voltage |
Millivolt / 24 VAC |
| Current Rating |
24 VA |
| Contact Material |
Gold |
| Application |
Gas furnaces, boilers, water heaters |
| Replaces |
GSK-3 |
🚨 Common Symptoms This Part Fixes
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Appliance shuts down due to flue gas spillage
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Frequent rollout or vent safety trips
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Sidewall venting safety lockouts
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Failed or non-resettable spill switches
❓ Frequently Asked Questions (FAQ)
Q: What does a gas spill switch do?
A: It detects excess heat caused by flue gas spillage and shuts down the appliance to prevent unsafe operation.
Q: When does this switch open?
A: It opens at 200°F.
Q: Is this an automatic or manual reset switch?
A: This is a manual reset switch and must be reset after activation.
Q: Can this be used on millivolt systems?
A: Yes, but a TCA-1 thermocouple adapter is required for 30 millivolt applications.
Q: What does this replace?
A: This model directly replaces Field Controls GSK-3.
🛒 Shopping Tips
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Confirm 200°F trip temperature matches appliance requirements
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Check voltage type (millivolt or 24 VAC)
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For 30 mV systems, order the TCA-1 adapter
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Always investigate venting issues before resetting the switch
