
L250-40F Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $10.99 | Condition is New, Furnace Single Pole Snap Disc Limit Switch 250 Replaces Supco SHL250 L250-40F, FREE SHIPPING | ![]() |
![]() | $32.51 | Top Pick! Condition is New, Supco SHL518 L250-40f Limit Switch, FREE SHIPPING | ![]() |
![]() | $33.11 | Condition is New, Supco SHL518 L250-40F LIMIT SWITCH, FREE SHIPPING | 98.5% |
![]() | $35.99 | Condition is New, NEW Furnace Replacement Limit Switch supco L250 OEM , FREE SHIPPING | 95.5% |
![]() | $29.99 | Condition is New, OEM Supco K34-870 Reverse Flow Switch 250 Open/210 Close Limit Switch L250, shipping cost = $14.99 | 100.0% |
![]() | $33.06 | Condition is New, Supco SHL518 L250-40 SPST Limit Switch 250F 3.12" Probe HVAC, shipping cost = $24.33 | 97.7% |
| photo | price | summary | rating |
|---|---|---|---|
![]() | $20.00 | Condition is Used, SUPCO 74T11 310712 L250-40F ADJUSTABLE LIMIT SWITCH, FREE SHIPPING | 99.4% |

The SUPCO L250-40F K34-870 is a versatile reverse flow switch designed for use in a wide range of industrial and commercial applications. This switch is specifically engineered to provide reliable temperature control in applications where coolant temperature must be maintained below a certain level to ensure optimal system performance.
The L250-40F K34-870 is a Type K thermocouple operated reverse flow switch. It features two temperature settings: one for 250 F open and another for 210 F close. This design allows the switch to open when coolant temperature falls below the set point of 250 F, and close when the temperature rises above 210 F. The Always On feature ensures the switch remains in the closed position when the coolant temperature is above the 210 F set point, providing continuous power to the system.
Constructed of high-quality materials to ensure durability, this switch includes a stainless steel body and ceramic insulator. The terminals are of brass material, providing excellent conductivity and resistance to corrosion. The threaded connection is NPT (National Pipe Taper) 1/4" for easy installation on most industrial piping systems.
This switch has a quick disconnect feature, allowing for easy removal of the thermocouple sensor for maintenance or replacement purposes without interrupting power to the system. With a maximum operating voltage of 240VAC or 120VAC, and a maximum current of 5 Amps, it is suitable for use with both single-phase and three-phase power supplies.
Additionally, the L250-40F K34-870 reverse flow switch is RoHS (Restriction of Hazardous Substances) compliant, meaning it does not contain any hazardous substances regulated by the European Union's RoHS directive. The switch operates with a temperature accuracy within /- 3 F, and comes with a one-year warranty from the manufacturer, ensuring peace of mind for the user.
In summary, the SUPCO L250-40F K34-870 reverse flow switch is a robust and reliable temperature control solution for various industrial applications. Its efficient design, easy installation, and durable construction make it a valuable asset in cooling systems that require precise temperature regulation.
The SUPCO L250-40F K34-870 Reverse Flow Switch is a device used in refrigeration systems to prevent the refrigerant from flowing in the wrong direction, which can cause damage to the system. Here are some potential pros and cons of buying this specific switch:
Pros:1. Reverse flow protection: The primary function of this switch is to protect the compressor from damage caused by refrigerant flow in the wrong direction.
2. Dual temperature settings: The switch has both 250 F open and 210 F close limits, which allows you to configure it to your specific refrigeration system requirements.
3. Sensor design: The sensor design of the switch is reversed from some other models, which can make it easier to install in some applications.
4. UL listed: The switch is UL listed, which means it meets the safety standards set by the Underwriters Laboratories, ensuring product safety.
Cons:1. Complexity: This switch may be more complex to install than simpler on/off switches due to its reverse flow and dual temperature settings.
2. Higher cost: Compared to on/off switches, reverse flow switches with temperature sensors can be more expensive.
3. Limited compatibility: The switch may not be compatible with all refrigeration systems and may require specific wiring configurations.
4. Manual reset: Some users have reported that the switch may require a manual reset in some situations.
Conclusion:The SUPCO L250-40F K34-870 Reverse Flow Switch can provide essential protection for your refrigeration system against reversed refrigerant flow damage. Its dual temperature settings and reversed sensor design make it a versatile and effective solution for specific applications. However, the switch can be more complex to install and has a higher cost compared to simple on/off switches. It may also have limited compatibility and may require manual resetting in certain situations.
Recommendation:If you have a refrigeration system that requires reverse flow protection and temperature control, the SUPCO L250-40F K34-870 Reverse Flow Switch could be a good investment. However, it may be necessary to consult the manufacturer's installation manual and wiring schematics to ensure a smooth installation. Additionally, compare prices from various suppliers to ensure you get the best deal.
Details:
Limit switch L250. Qty:1 oem Supco K34-870 reverse flow switch. 250 open/210 close.
specifications indusswitch:
- brand: Supco
- mpn: L250-40f
- model: L250, K34-870, 610080, 1330, T-o-d 60t11, L250-40f
- mounting style: Fixed
- type: Furance Snap Disc Limit Switch
- termination type: Connector
- color: Black
- fuse type: Switch
- orientation: Horizontal/vertical
- country/region of manufacture: United States
- unit quantity: 2-5-2025-g. Box. Met.-lh New
- application: Fan Control
- upc: 687152020690
seller indusswitch:
- # reviews: 2433
- rating: 99.5%
- city: kent, washington
offer indusswitch:
- best offers: true
- sold #: 23
- in stock #: 5
- prices: $10.99–$35.99
- item condition:
- New
- Used
- availability: in stock
- started: february 6, 2025
- options: ship-to-home
shipping indusswitch:
- transit: 4-9 days
- carrier: usps, ups
- class: standard
- type: fixed
- service: usps ground advantage, ups ground
returns indusswitch:
- policy: returns accepted
- paid by: buyer
- time: 30 days
- method: money back
general indusswitch:
- category: Business & Industrial > Electrical Equipment Supplies > Limit Snap Action Switches
payments indusswitch:
- wallet: paypal
- other
- credit card: discover







