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Thermal Protector CXO

Power class: 25,0 A to 75,0 A
Type series: XO

  • normally closed
  • resets automatically
  • with connector cables
  • without insulation
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Thermal Protector CXO
Thermal Protector CXO
Thermal Protector CXO
Thermal Protector CXO

Switchgear consisting of a movable silver contact (1), a contact bearing pin (2), a spring snap-in disc (3), a bimetallic disc (4) and a contact tongue (5) which is riveted into one another, undetachable and fixed in a positive lock and self-aligning between a conductive, heat transferring housing (6) and a contact cap (7) made of steel that is insulated from it, plus a stationary countercontact (8). At the same time, the switchgear is supported by the contact tongue (5) acting as a transfer element for electric current which is held between a supporting collar and a circumferential ring. As such, the switchgear underlying it, that is also stuck out from the movable contact (1), can continuously work (exposed) by mechanical loads without the contact pressure defined by the spring snap-in disc (3) diminishing. As soon as the bimetallic disc (4) reaches its rated switching temperature, it effectively springs against the throw force of the spring snap-in disc (3) into its inverted position. The contact is abruptly opened. The temperature will now fall. The bimetallic disc (4) will only snap back upon reaching a defined spring back temperature and the contact is abruptly closed again.

Technical specifications

Nominal switching temperature (NST) in 5°C
70 °C - 180 °C
Tolerance (standard)
±10 K
Reverse switch temperature (RST)
≥ 35 °C
≥ 35 °C
(defined reset temperature possible on customer request)
Installation height from
7.0 mm
17.1 mm
Resistance to impregnation
Suitable for installation in protection class
Pressure resistance to the switch housing
600 N
Standard connection
Lead wire 1.75 mm² / AWG14
Operating voltage range AC / DC
up until 500 V AC / 14 V DC
Rated voltage AC
Rated current AC cos ϕ = 0.0 / cycles
25.0 A / 0
Max. switching current AC cos ϕ = 1.0 / cycles
50.0 A / 10,000
Max. switching current AC cos ϕ = 1.0 / cycles
63.0 A / 3,000
Rated voltage DC
12.0 V
Max. switching current DC / cycles
63.0 A / 10,000
Total bounce time
< 1 ms
Contact resistance (according to MIL-STD. R5757)
≤ 5 mΩ
Vibration resistance at 10 ... 60 Hz
100 m/s²


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