Thermal Protectors type CK1 / SK1 / LK1 / NK1; 1.6 – 7.5 A

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The types CK1, SK1, LK1 and NK1 are automatically resetting switches with or without Expoxy
CK1, SK1, LK1 with connecting cables
SK1 insulated with Mylar®-Nomex® cap
LK1 with screw-on housing
NK1 with connecting wires, partially insulated with plastic cap
Possible applications in control cabinets, on motor housings or heat sinks, printed circuit boards

 

Art.-Nr.
CK1
SK1
LK1
NK1

 

Switching type NC contact CK1 resetting NC contact SK1 resetting NC contact LK1 resetting NC contact NK1 resetting
Insulated: Housing / insulating cap Yes Yes no no
Partially insulated: Plastic cap no no no yes
Temperature
Reverse Switch Temperature (NST), [°C], in 5 K steps 60 – 200
Tolerance range -Standard- Tol [ [K] ± 5
Reverse Switch Temperature (RST below NST) UL [K]
Switch-back temperature (RST below NST) VDE [°C]
-35 ± 15
≥ 35
Tension
max. operating voltage range up to … 500 V DC / 14 V DC
Rated voltage AC [VAC] 250 ( VDE), 277 (UL)
Current/switching cycles
Rated current AC – cos φ = 1.0 [A] / [n] 2,5 / 10’000
Rated current AC – cos φ = 0.6 [A] / [n] 1,6 / 10’000
max. Switching current – cos φ = 1.0 [A] / [n] 6,3 / 3’000 7,5 / 300
Rated current cos φ = 0.4 [A] / [n] 1,8 / 10’000
max. Switching current – cos φ = 0.4 [A] / [n] 7,2 / 1’000
Rated voltage DC [V] 12
Max. Switching current DC [A] / [n] 40,0 / 10’000
Additional specifications
High-voltage strength [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
Compressive strength of the switch housing [N] 450
Suitable for installation in protection class I I + II I + II I
Impregnation resistance suitable
Available Licenses and Approvals
please specify IEC, ENEC, VDE, UL, CSA, CQC IEC, ENEC, VDE, UL, CQC
Dimensions (standard)
Diameter Ø d [mm] 10,0 10,0 10,0 10,0
Overall height h [mm] from 3.9 from 4.3 from 7.0 3,4
Length of connection pin l [mm] 15,0 14,0 / 20,0
Thread (size x length ) [M x mm] M4 x 5
Width across flats / max. Torque [mm / Nm] 10,0 / 2
Standard stranded wire connection: 0.25 mm2/AWG 22 Connection wire d = 0.5 mm
Characteristics of current dependence
The special feature of the 01 and 02 series is that they are temperature-sensitive switches. In their rated operation (rated current), they exhibit very low self-heating due to the current. Therefore, a switching point reduction takes place at most within the nominal switching temperature tolerance.

 

CK1
SK1
LK1
NK1

 

Note

The data and information provided are based on tests and test series. They are intended as a guide, which is why there may be deviations for individual applications and uses. The suitability in a specific application must be checked by the user in each individual case.