The Siemens 5SM2322-0 is a SENTRON residual current device (RCD) designed as a companion unit for the 5SY series miniature circuit breakers. It is a 2-pole, instantaneous-trip RCD rated at 40 A with a 30 mA Type AC residual current sensitivity, intended for installation in distribution boards where it occupies 2 modular width units (71 mm wide). Rated insulation voltage is 460 V, surge voltage resistance is 4 000 V, and the operating frequency is 50 Hz. The unit carries a degree of pollution 2 and overvoltage category III, fitting standard residential and commercial panel environments.
Supply connection can be made from top or bottom. The unit is not sealable. Temperature derating is specified from 40 °C upward: 37.2 A at 40 °C and 45 °C, 36 A at 50 °C, 34.8 A at 55 °C, 34 A at 60 °C, 33.2 A at 65 °C, and 32 A at 70 °C. The minimum test voltage is 195 V AC.