White-Rodgers 3L05-1 Adjustable Snap Disc Limit Control, 135–175°F Setpoint Range, 40°F Differential, Open-on-Rise, 1/4″ Quick-Connects, 120/240 VAC Motor/Pilot Ratings

White-Rodgers 3L05-1 Adjustable Snap Disc Limit Control, 135–175°F Setpoint Range, 40°F Differential, Open-on-Rise, 1/4″ Quick-Connects, 120/240 VAC Motor/Pilot Ratings (UPC 786710002070)

Condition: New in original factory plastic wrapper, sealed; unused. Terminals and body clean; no signs of installation.

This White-Rodgers (Emerson) 3L05-1 is an adjustable snap-disc limit thermostat designed to open on temperature rise. The dial-adjustable setpoint (from 135°F to 175°F) lets you match the control to your application and reduce the number of fixed-temperature discs you need to stock. With 1/4″ quick-connect terminals, a robust 40°F differential, and generous motor and pilot-duty ratings at 120/240 VAC, it’s a dependable high-limit for warm-air furnaces, unit heaters, hydronic fan coils, dryers, and general equipment where a compact open-on-rise limit is required.

Features

• Adjustable setpoint: 135–175°F range (open on rise) to match site conditions.
• Wide 40°F differential: Helps prevent short-cycling on marginal airflow/heat soak.
• ¼” quick-connect terminals: Fast, tool-less service with standard spade connectors.
• Inventory reducer: One adjustable control replaces many fixed-temp discs.
• Compact snap-disc form factor: Fits tight plenums and appliance cavities.
• UL/CSA style motor ratings: Suitable for fan motors and control circuits (see below).
• Brand/UPC: White-Rodgers / 786710002070.

Specifications

• Application: High-limit / safety limit (opens on temperature rise)
• Setpoint Range: 135°F to 175°F (57°C to 79°C)
• Differential: 40°F
• Switch Action: Open on rise (closes on fall)
• Electrical Ratings:
  • 120 VAC: 14 A FLA, 72 A LRA
  • 240 VAC: 10 A FLA, 60 A LRA
  • Pilot Duty: 125 VA @ 120/240 VAC
• Terminals: 1/4″ male quick-connects
• Mounting/Body: Snap-disc thermostat, fixed temperature sensing surface
• Model: 3L05-1 (White-Rodgers/Emerson)

Applications / Spheres of Use

• HVAC heating equipment: Warm-air furnaces, mobile-home furnaces, unit heaters, cabinet heaters (as high-limit).
• Fan-assisted hydronic/coil units: Fan coils, kickspace heaters (discharge limit).
• Appliances & equipment: Dryers, kilns, ovens (auxiliary limit where ratings permit).
• Electrical & HVAC service stock: Field replacement where an open-on-rise adjustable limit is specified.

Cross-Referenced / Related White-Rodgers Models

• 3L05-1 — Adjustable limit (open on rise), 135–175°F (this item).
• 3L05-2 / 3L05-3 — Adjacent adjustable limit variants used in similar applications (ranges/differentials vary by sub-model).
• 3F01- / 3F05- series — Adjustable fan controls (close on rise / open on fall), often paired with 3L-series limits in furnaces.
• With the 3L051WHITERODGERSADJLIMIT135175DEG, MRS39220, WHITE, RODGERS, 977, ITM613177, 786710002070, 786710002076, and 20786710002070 key numbers, you can easily double check that you have the correct Emerson 3L05-1 Snap Disc Fan Control.

(Always verify action—open-on-rise vs. close-on-rise—and temperature range before substituting.)

Comparable Products (same function/class)

• Robertshaw / Uni-Line adjustable snap disc limits (e.g., 36T/36TX adjustable variants).
• Therm-O-Disc adjustable/field-settable snap-discs with similar ratings.
• Supco universal adjustable high-limit snap discs.

Use in Larger Systems / Integration Notes

• Commonly wired in series with burner or blower circuits as a safety limit.
• Mount with firm thermal contact to the heat-source surface or airstream location specified by the OEM.
• After adjustment, document the setpoint and verify cut-out/cut-in with a calibrated thermometer or thermocouple.
• When replacing a fixed disc, set the adjustable model to the OEM-specified limit temperature.

Trademarks

White-Rodgers and Emerson are trademarks or registered trademarks of Emerson Electric Co. All other brands or trademarks mentioned are the property of their respective owners and are used strictly for identification purposes only.

Related

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Common Requests:

1. “Is the 3L05-1 open-on-rise or close-on-rise, and where is it used?”
2. “What amperage ratings does the 3L05-1 carry at 120/240 VAC?”
3. “How do I set and verify the cut-out temperature on this adjustable disc?”
4. “Can this replace my fixed 160°F or 170°F snap disc?”
5. “What’s the difference between 3L (limit) and 3F (fan) White-Rodgers snap discs?”