Temperature limiter type CW1 / SW1 / CWK / VW1

CWK, SW1, VW1 and VWK live current-sensitive, latching switches, with connecting wires

SW1 and VW1 fully encapsulated in Mylar®- Nomex® insulating cap

Switching type: Normally closed contact CW1 Normally closed contact SW1 Opener CWK Opener VW1
self-retaining , defined current-sensitive
Insulated: with insulation protection cap no yes no yes
Temperature
Nominal switching temperature (NST), in 5 K steps [°C] 60 – 160
Tolerance range -Standard- Tol[ [K] ± 5
Switch-back temperature (RST below NST) UL [°C]

VDE [°C]

 > 35

> 35
Tension
Operating voltage range AC from … [VAC] 100 to 250
Rated voltage 50/60 Hz [VAC] 250 (VDE), 277 (UL)
Current/switching cycles
Rated current – cos j = 1.0 [A] / [n] 2,5 / 1‘000
Nennstrom – cos j = 0,6 [A] / [n] 1,6 / 1‘000
max. Switching current – cos j = 1.0 [A] / [n] 9,0 / 1‘000
Other data
Series resistors for setting the current sensitivity   from 0.12 Ω to 70 Ω  
High-voltage resistance [kV] — 2 — 2
Total bounce time [ms] < 1
Contact resistance (according to MIL-STD R5757) [mΩ] £ 50
Vibration resistance 10 … 60 Hz [m/s2] 100
Suitable for installation in protection class I I + II I I + II
Impregnation resistance suitable
Self-retaining with heating resistor RH (TB = 80 °C or 150 °C) down to -20°C, freely suspended in still air. Correspondingly higher temperatures with thermal coupling. PTC heating resistor
Available licences
please specify IEC, ENEC, VDE, UL IEC, VDE, UL IEC, VDE, UL IEC, VDE
Dimensions (standard)
         
Diameter Ø d [mm] 9,0 9,4 9,0 9,9
Overall height (with standard connection) h [mm] from 5,1 from 5,6 from 5,1 from 5,8
Length of the insulation cap l [mm] — 18,0 — 19,0
Standard connection wire: Ø= 0,5 mm / AWG 22
Functional circuit diagram – Standard –
When the switch is opened, the current flows through the PTC heating resistor and heats the switch so that it remains switched off until the voltage is removed. The series resistor is used to adjust the current sensitivity, as its heating causes the switch to trip earlier.

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