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Product Overview
Motor thermal protector/thermal circuit breaker
No flicker, precise working temperature
Small thermal protector with plastic shell
Realize stable, reliable and long service life with non-current-carrying device desig
Scope Of Application
KW is designed to protect users and equipment in fan motors, washing machines and other products. It can be used as a self-resetting thermal circuit breaker (type 2B), motor protector (type 3C) and ballast thermal protector.
Design Principle
KW has a simple structure design and high enough sealing performance to be suitable for dipping paint process. The reinforced shell product can also be tied to the winding.
The spring arm transmits the current from the lead to the terminal embedded in the lower block through the movable contact and the static contact. The spring arm, the bimetallic sheet, and the bottom plate are riveted together by an insulating block, and then the assembly is inserted into the shell, and then sealed with epoxy resin.
Since the trip time of cutting off the power supply depends on the operating temperature of the KW protector, the temperature class should be selected correctly, and the model that matches the motor can be selected by referring to the performance curve.
Technical characteristics
KW is designed to protect users and equipment in fan motors, washing machines and other products. It can be used as a self-resetting thermal circuit breaker (type 2B), motor protector (type 3C) and ballast thermal protector.
KW can be directly connected to the windings, and can also be installed outside the resin-sealed motor by clamping or inserting. It can directly cut off the circuit. Due to the plastic shell, the metal parts of the KW protector and the motor do not need to be insulated.
MODEL | Voltage | 60V-DC | 120V-AC | 250V-AC | 380V-AC |
KW-1B | Current | 6A/10A | 6A/10A | 6A/10A | / |
KW-3B | Current | 5A | 5A | 5A | / |
KW-1B02、3B02 | Current | 5A | 5A | 5A | / |
KW-3B02A | Current | 2A | 2A | 2A | / |
Safety Certification
UL&CUL: E258861 (UL2111 standard)
CQC: 10002045188 (GB14536.1-2008 standard; GB14536.3-2008 standard) motor thermal protector
16002141806 (GB14536.1-2008 standard; GB14536.10-2008 standard) temperature sensitive controller
ETL&CETL: 3191958 (UL873 standard)
TUV: 50366282 (EN60730-1 standard; EN60730-2-9 standard, plastic case life of 20,000 times)
VDE: 40030067 (EN60730-1 standard; EN60730-2-2 standard)
KC: ZU02045-17002 (K60730-1 standard; K60730-2-2 standard)
CB: CN35137-M1 (IEC60730-2-2 standard)
DE2-021471 (IEC60730-2-9 standard)
Patent Number
KW type: ZL200620126343.3
Product dimensions
Model | Plastic outer case | ||
L（mm） | W（mm） | H（mm） | |
KW-1B | 19.5mm | 8mm | 4.2mm |
KW-3B | 15.8mm | 7.2mm | 3.8mm |
KW-3B02 | 15.5mm | 7.2mm | 3.8mm |
KW-3B02 A | 13.5mm | 5.4mm | 2.4mm |
Operating temperature: 40~160℃±5℃, every 5℃, it is a temperature specification.
Reset temperature: 2/3 of the nominal operating temperature, with a tolerance of ±15°C, or made according to customer requirements.
Number Naming Reference
Temperature Specification
Operating Temperature | Reset Temperature | Operating Temperature | Reset Temperature |
40±5℃ | ≥27℃ | 105±5℃ | 70±15℃ |
45±5℃ | ≥30℃ | 110±5℃ | 70±15℃ |
50±5℃ | ≥30℃ | 115±5℃ | 75±15℃ |
55±5℃ | ≥30℃ | 120±5℃ | 80±15℃ |
60±5℃ | ≥35℃ | 125±5℃ | 85±15℃ |
65±5℃ | 40±15℃ | 130±5℃ | 90±15℃ |
70±5℃ | 45±15℃ | 135±5℃ | 95±15℃ |
75±5℃ | 50±15℃ | 140±5℃ | 100±15℃ |
80±5℃ | 55±15℃ | 145±5℃ | 105±15℃ |
85±5℃ | 60±15℃ | 150±5℃ | 110±15℃ |
90±5℃ | 65±15℃ | 155±5℃ | 115±15℃ |
95±5℃ | 65±15℃ | 160±5℃ | 120±15℃ |
100±5℃ | 65±15℃ | Special specifications according to customer requirements | |
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