1/2" Bimetallic Snap Disc Thermostat (Auto Reset) | NGT


Minimum order quantity: 10 of each thermostat

High quality surface mounted 1/2" bimetallic snap disc (auto reset) thermostats from Japanese manufacturer NGT. Designed for long-term reliability.

Available either as normally closed (typical applications like top temperature limiters on heaters) or normally open (typical applications such as cooling fans and alarms)

Body Material: Normally Phenolic – to 150°C set points; Also available as Polyester/Bio-glass –170°C set point and Ceramic – 200°C to 250°C set points

Electrical rating: AC 120V/AC 240V 15A/10A | Standard Contact Point

Also available on request:
Electrical rating AC 120V/DC6-30V 100mA | Cross-Bar Contact Point - see 03EP datasheet or 52P datasheet
Electrical rating AC 120V/AC 250V 6A/3A | Conical Contact Point - see 03EC datasheet

For further information or to request a test sample for your product design, contact our OEM design team on 01483 869 070 or email sales@hawco.co.uk


Image is for display purpose only
Product Code Set Point Reset Point Operation Type Mounting Price Qty
311-147 15C +/- 3C 5C +/- 3C Normally Closed 03 Vertical
£3.59
311-148 20C +/- 3C 10C +/- 3C Normally Closed 03 Vertical
£6.10
311-150 30C +/- 3C 20C +/- 4C Normally Closed 03 Vertical
£3.41
311-250 40C +/- 3C 25C +/- 5C Normally Open 03 Vertical
£2.89
311-151 40C +/- 3C 25C +/- 5C Normally Closed 03 Vertical
£3.31
311-101 40C +/- 3C 25C +/- 5C Normally Closed 03 Horizontal
£3.01
311-152 50C +/- 3C 35C +/- 5C Normally Closed 03 Vertical
£3.32
311-102 50C +/- 3C 35C +/- 5C Normally Closed 03 Horizontal
£2.87
311-251 60C +/- 3C 45C +/- 4C Normally Open 03 Vertical
£2.87
311-103 60C +/- 3C 45C +/- 4C Normally Closed 03 Horizontal
£2.84
311-154 70C +/- 3C 55C +/- 5C Normally Closed 03 Vertical
£2.82
311-104 70C +/- 3C 55C +/- 5C Normally Closed 03 Horizontal
£2.77
311-155 80C +/- 3C 65C +/- 5C Normally Closed 03 Vertical
£2.87
311-105 80C +/- 3C 65C +/- 5C Normally Closed 03 Horizontal
£2.81
311-256 90C +/- 3C 75C +/- 4C Normally Open 03 Vertical
£2.84
311-156 90C +/- 3C 75C +/- 4C Normally Closed 03 Vertical
£2.72
311-106 90C +/- 3C 75C +/- 5C Normally Closed 03 Horizontal
£2.81
311-157 100C +/- 3C 85C +/- 6C Normally Closed 03 Vertical
£2.74
311-159 110C +/- 4C 95C +/- 6C Normally Closed 03 Vertical
£3.09
311-107 100C +/- 3C 85C +/- 5C Normally Closed 03 Horizontal
£7.19
311-108 110C +/- 4C 95C +/- 6C Normally Closed 03 Horizontal
£2.90
311-158 125C +/- 4C 110C +/- 6C Normally Closed 03 Vertical
£2.87
311-109 125C +/- 4C 110C +/- 6C Normally Closed 03 Horizontal
£2.91
311-114 140C +/- 4C 120C +/- 6C Normally Closed 03 Horizontal
£6.29
311-160 150C +/- 4C 130C +/- 6C Normally Closed 03 Vertical
£2.81
311-110 150C +/- 4C 130C +/- 6C Normally Closed 03 Horizontal
£2.89
311-112 170C +/- 5C 140C +/- 10C Normally Closed 03 Horizontal
£4.00
311-335 200C +/- 10C 160C +/- 15C Normally Closed 52 Vertical
£4.62
311-337 225C +/- 10C 175C +/- 15C Normally Closed 52 Vertical
£5.65
311-339 250C +/- 10C 200C +/- 20C Normally Closed 52 Vertical
£5.60


Bimetallic Snap Disc Cut Out Thermostat Specifications



Approvals: VDE, UL, CSA

Electrical life: 100,000 cycles 10A, 10,000 cycles 16A

Contact resistance: <30m ohms

Terminals: 6.3mm x 0.8mm male quick connect

Dielectric strength: 1500Vac 1 minute

Dimensions: 33 x 12 x 16mm (W x H x D) – horizontal terminal; 17 x 21 x 16mm (W x H x D) – vertical terminal

Fixing centres: 24.5mm (hole 3.2 x 3.7mm)

Insulation resistance: 1M ohm min. @ 500Vdc

Contact rating: SPST 16A 250Vac, 15A 125Vac resistive

Typical applications



normally closed – top temperature limiters on heaters,

normally open – cooling fans, alarms

Body Material:



Phenolic – to 150°C set points,

Polyester/Bio-glass –170°C set point,

Ceramic – 200°C to 250°C set point

Mounting Bracket: Stainless Steel





About NGT Snap Disc Thermostats


Thermostats are a crucial safety element in many household and commercial products. That’s why we only offer bimetal thermostats designed by NGT Controls, a top Japanese manufacturer respected for its product quality and reliability.

Certified to worldwide standards, these thermostats are widely used in car seat heating, boilers, commercial catering equipment and domestic appliances.

NGT thermostats are trusted in brands as diverse as Daikin, Toyota, Bosch, Siemens, Miele, Baxi and Panasonic.

And with a wide range of options to choose from, we can recommend a part with the precise specification to meet any product design or manufacturing requirements at a highly competitive price.


Please Note: For all Export orders a member of our team will contact you to arrange shipping

Please Note - In some cases the alternatives might be under or over powered or dimensionally different, if you are unsure we recommend calling the office on 01483 869100

Why CO2?: Natural refrigerant

EU F-Gas Regulation is a key priority for European countries. It ensures compliance with the Kigali Amendment supporting international climate commitments on greenhouse gases and leading the global transition to climate-friendly HFC-free technologies.

Carbon dioxide (R–744) is regaining its place in the refrigeration world. Driven by environmental concerns, legislation is requiring increased adoption of ‘alternative’ refrigerants, of which CO2 is one.

CO2 is a very attractive refrigerant from an environmental perspective. Zero ODP and “GWP” (Global Warming Potential)=1 means natural substance in the atmosphere.

In Europe a step-by-step HFC reduction has been in place since the F Gas regulation was introduced in 2015. In fact, not only in Europe but also other countries all over the world have actively been preparing to enact the necessary domestic legislation to implement the agreement for reducing the use of HFCs.

Panasonic is now able to provide a solution in Europe with CO2 refrigeration systems to prevent global warming and to support environment-friendly retail operations.

The following table shows how well R744 (CO2) performs regarding environmental impact and safety.

Bimetallic Snap Disc Cut Out Thermostat Specifications



Approvals: VDE, UL, CSA

Electrical life: 100,000 cycles 10A, 10,000 cycles 16A

Contact resistance: <30m ohms

Terminals: 6.3mm x 0.8mm male quick connect

Dielectric strength: 1500Vac 1 minute

Dimensions: 33 x 12 x 16mm (W x H x D) – horizontal terminal; 17 x 21 x 16mm (W x H x D) – vertical terminal

Fixing centres: 24.5mm (hole 3.2 x 3.7mm)

Insulation resistance: 1M ohm min. @ 500Vdc

Contact rating: SPST 16A 250Vac, 15A 125Vac resistive

Typical applications



normally closed – top temperature limiters on heaters,

normally open – cooling fans, alarms

Body Material:



Phenolic – to 150°C set points,

Polyester/Bio-glass –170°C set point,

Ceramic – 200°C to 250°C set point

Mounting Bracket: Stainless Steel





About NGT Snap Disc Thermostats


Thermostats are a crucial safety element in many household and commercial products. That’s why we only offer bimetal thermostats designed by NGT Controls, a top Japanese manufacturer respected for its product quality and reliability.

Certified to worldwide standards, these thermostats are widely used in car seat heating, boilers, commercial catering equipment and domestic appliances.

NGT thermostats are trusted in brands as diverse as Daikin, Toyota, Bosch, Siemens, Miele, Baxi and Panasonic.

And with a wide range of options to choose from, we can recommend a part with the precise specification to meet any product design or manufacturing requirements at a highly competitive price.


Please Note: For all Export orders a member of our team will contact you to arrange shipping

Delivery & Returns

Delivery Policy

For Quick Pick and website items only, delivery is free of charge for orders over £50.00. For Quick Pick and website orders below £50.00, a £15.00 delivery and administration fee will be charged.

Hawco offers a next day delivery service for orders placed before 4pm Monday - Friday. The delivery service is standard to all central UK. If you require overseas or timed delivery, please call the sales office on Hawco: 01483 869070

Special Carriage Costs

When ordering online and chosing a "Special Carriage Charge" the times given are subject to a 30 minute grace period (therefore 10:30 deliveries have up to 11am to be delivered) and work off a next working day basis. Please make sure that if a timed carriage option is selected that someone is available to sign for the consignment as without this it will be subject to being returned to the delivery depot for a redelivery 1-2 days later.

N.B - Deliveries requested for Pre 9.30am are subject to being delivered as early at 7am.

N.B - All orders processed after 4pm, weekends or Bank Holidays are subjected to being processed the following working day

Returns Policy

An RMA request must be completed online at http://hawco.returnsportal.net/

If approved, an automated RMA email will be sent. This will reference a unique RMA number. The automated RMA approval email will prompt you to log into the online returns system and print off the RMA packing slip, which is to be affixed to the outside of the packaging.

N.B. Returns will not be accepted without a returns authorisation number (RMA) and will be returned at the sender’s expense.

When you have your returns authorisation number (RMA), please ensure you send the return to our Logistics Centre:

Hawco Logistics Centre,
8 Cranfield Road,
Lostock Industrial Estate,
Lostock,
Bolton, UK
BL6 4SB

N.B. - Any returns sent to the Hawco Head Office in Godalming and not the Logistics Centre address in Bolton will be refused. This may cause excessive delay in handling the return, or possible loss if your carrier mislays the delivery. Hawco cannot accept any liability for items which are not correctly addressed or packaged for return.

Credit or replacement product will only be issued on receipt and Hawco’s acceptance of faulty or damaged items. Items that are returned which are subsequently determined to have been damaged by the customer and or by their agent may be subject to an investigation and admin fee. In all instances any logistical costs incurred by Hawco during this process will be chargeable.

Item(s) must be returned within 7 days of the issue of the returns number. If not returned by this date then no credit will be given.

Items ordered incorrectly or that are surplus to requirements may be subject to a 20% restocking charge and will only be accepted within the first 3 months of sale and are still in the original packaging. Items ordered in specifically may be refused entirely.

N.B. No credit will be issued to any surplus items that are received damaged.

The customer has a 3 day window to report items that have been received damaged, failure to do so will result in your returns claim being rejected.

All deliveries and returns are subject to our standard Terms & Conditions of sale. - See more at: http://hawco.returnsportal.net/ReturnPolicy/

Please Note - In some cases the alternatives might be under or over powered or dimensionally different, if you are unsure we recommend calling the office on 01483 869100