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Ten silver and black bimetal thermal switches with short wire leads

Unique-Bargains

Unique-Bargains KSD9700 50C N.C Bimetal Temperature Switch Thermal Protector 250V 5A 10 Pack

SKU CH-08KR-J7YQ0

Pack of ten normally-closed bimetal thermal protectors that open at 50 °C, rated 250 V 5 A with 6.5 cm leads

  • Product typeHI - Soldering
  • Pack of 10 thermal protectors for multiple installations
  • Normally closed contact opens at 50 °C to cut power
  • Rated for 250 V and 5 A continuous current
  • Bimetal sensing element reacts without external power
  • 5 cm leads and compact 20 × 8 mm head fit tight spaces

Pack of ten thermal switches

This pack contains ten KSD9700 bimetal temperature switches rated for 250V and 5A. Each unit opens its normally closed contacts at 50°C to protect motors and heating elements from overheating. They suit repair work on air-conditioner motors, transformers and similar thermal appliances. The silver-tone and black bodies measure 20 x 8 x 3mm with 6.5cm leads.

Passive thermal protection

The switches operate without external power, relying on a bimetal strip that snaps open at the preset temperature. No fan, pump or active cooling is involved, so acoustic noise is zero and power draw is limited to the protected circuit itself. The contacts re-close automatically once the temperature falls below the trip point.

Compact wiring integration

Each switch fits into tight wiring looms thanks to its 20mm head and 6.5cm cable tails. The 2.6-inch leads allow direct soldering or crimping onto motor windings or transformer terminals without extra harnesses. The normally closed design means the circuit remains live until the 50°C threshold is reached, simplifying failsafe wiring for maintenance technicians.

How it compares

Measured against everything we stock in Soldering Irons & Stations, at today’s prices. Recalculated every night.

Price $7.99
Cheaper than about 92% of the 802 comparable items (median $25.99).

Specifications

Product
Brand nameUnique Bargains
Product typeHI - Soldering

Questions about this item

How do I install the KSD9700 50C switch and what wiring mistake should I avoid?

Solder the 6.5 cm leads into the circuit; the contacts are normally closed and open at 50 °C, so wire it in series with the load to cut power on overheat, not in parallel.

What maintenance or replacement will the bimetal thermal protector need after extended use?

The bimetal disc can fatigue after repeated 50 °C cycles; inspect for contact welding or drift and replace the unit if it no longer opens cleanly at the rated temperature.

What limit appears first when the KSD9700 runs continuously at its 5 A, 250 V rating?

The 50 °C disconnection temperature trips first; sustained current at the 5 A limit will heat the bimetal head to that point and open the circuit.

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