DC Miniature Circuit Breakers Ex9BD

DC miniature circuit breakers Ex9BD are suitable for short-circuit and overload protection of general direct current applications up to 63 A, for example in automation, control or household DC circuits.

They are offered in 1 and 2-pole versions with 1 module unit (18 mm) per pole. Tripping characteristics C and K.

Ex9BD MCBs can be supplemented as well as Ex9B and Ex9PN series devices with a wide range of accessories. They can be fitted with up to three units of auxiliary or signal contacts AX31, AL31, AXL31 and, at the same time with up to two release units. Releases are available as shunt-trip (opening) and under-voltage. They can be optionally combined as necessary. All these accessories is mounted to the breakers from the left side.

  • Rated operating voltage Ue 220 V DC per pole
  • Rated current 1 up to 63 A
  • Rated short circuit breaking capacity Icu 10 kA
  • 1 and 2 pole versions
  • Tripping characteristics C, K
  • Wide range of accessories
  • Polarity dependent


Documents Technical parameters
Tested according to EN 60947-2
Rated op. voltage Ue 220 (1P), 440 (2P)
Rated ultimate breaking capacity I cu 10 kA
Rated service breaking capacity I cs 100% Icu
Rated current I n 1 — 63 A
Tripping characteristics C, K
Rated impulse withstand voltage Uimp 6 kV
Rated insulation voltage Ui 800 V DC