It provides no overload or short-circuit protection — this is a disconnect-only device, sized for isolation and switching duty where the upstream protection is already coordinated. The unit carries an undervoltage release (UVR) for 24 VDC, which drops the contacts when control voltage is lost, adding a remote trip capability for safety circuits or emergency-off chains.
Rated continuous current Iu is 100 A — this is the maximum current the disconnector can carry continuously without exceeding its thermal limits. It is not a breaker rating; the part has no overcurrent release, so the 100 A figure governs the load-side conductor sizing and the upstream protection coordination. Maximum rated operational voltage is 690 VAC 50/60 Hz and 500 VDC, covering standard 400 V three-phase networks and many DC bus applications.
Undervoltage release and control wiring
The integrated undervoltage release (UVR) is designed for 24 VDC control. When the control voltage falls below the dropout threshold, the release mechanism trips the disconnector open. The UVR does not include a leading contact, so the release coil sees full inrush on energization — verify the 24 VDC supply can handle the pickup current without sag. No auxiliary contacts are fitted; if status feedback is needed, the optional auxiliary contact block must be added separately.
The 76.2 mm width (3-pole, 25.4 mm per pole) matches the standard SENTRON 3VA1 frame footprint; it occupies the same panel cutout as the equivalent MCCB version.