The Siemens 5SM9645-0KK is a 4-pole residual current unit (RC unit) from the SENTRON 5SM9 series, designed for type AC fault currents with a rated residual tripping current of 300 mA and a rated current of 63 A at 230/400 V AC. It's an instantaneous-trip electronic unit — no intentional time delay, so it clears ground faults as fast as the electronics can fire, which matters when you're coordinating downstream protection in a distribution board.
Siemens 5SM9645-0KK SENTRON RC Unit, 63 A, 300 mA, 4-pole
MPN5SM9645-0KK
Siemens SENTRON 5SM9 series RC unit electronic, 4-pole, type AC, rated current 63 A, tripping residual current 300 mA, rated voltage 230/400 V AC, instantaneous design.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Number of poles | 4 |
| Parameter | Value |
|---|---|
| Product designation | RC unit electronic |
| Product design / construction | Instantaneous |
Product details
Frequently asked questions
What is 5SM9645-0KK's rated current and residual trip?
It's rated 63 A continuous with a 300 mA residual tripping current, type AC, at 230/400 V AC, 4-pole, instantaneous trip.
MPN
5SM9645-0KK