The K-37 is a model of C&K HB series single pole standard precision snap-acting switches. This series of switches has the characteristics of low differential travel, high repeatability, long life, single and double pole circuitry, sealed actuator and case. It is suitable for applications such as thermostats, motors and industrial controls.
The HB Series from C&K offers single‑pole standard precision snap‑acting switches designed for industrial controls, thermostats, motors and other applications. The switches feature low differential travel, high repeatability, sealed actuator and case, and an IP65 protection rating.
Key specifications include contact ratings up to 20 A @ 480 V AC, 150 000 cycle electrical life, insulation resistance of 1 000 MΩ, dielectric strength of 1 500 V rms, operating temperature from –67 °F to 302 °F, and selectable operating forces from 4 oz to 26 oz. Various actuator options, mounting styles, and termination types are available to suit different installation needs.
| Contact rating | From low level* to 20 A @ 480 V AC |
|---|---|
| Electrical life | 150,000 cycles at 20 A @ 250 V AC |
| Insulation resistance | ≥ 1,000 MΩ |
| Dielectric strength | ≥ 1,500 V rms (sea level) |
| Operating temperature | -67 °F to 302 °F (-55 °C to 150 °C) |
| Operating force | 4 oz to 26 oz (depending on actuator) |
| Degree of protection | IP65 (dust‑proof, water‑splash) |
| Mounting screw torque | Maximum 3 in‑lb |
The switches are rated from low‑level conditions up to 20 A at 480 V AC.
They meet an IP65 rating, offering dust‑proof and water‑splash protection.
The switches operate from –67 °F to 302 °F (‑55 °C to 150 °C).
The electrical life is specified as 150,000 cycles at 20 A @ 250 V AC.