The 5SU1656-0KV25: Rated at 25A with a B-curve trip characteristic (trips between 3-5x In for short-circuit protection) and a 300mA residual current sensitivity (Type AC, meaning it detects sinusoidal AC fault currents only). Breaking capacity is 6kA, which covers most domestic and light commercial sub-distribution boards. The 70mm width (4 module spaces) is standard for this class of 1+N RCBO — fits DIN-rail enclosures without crowding adjacent ways. For the sourcing buyer: this is a current-production part, so no lifecycle risk on a new BOM line. Availability and pricing confirmed at quote time against an RFQ through independent distribution.
What the ratings mean for panel fit
The 300mA IΔn (residual operating current) means this unit is sized for protection against fire risk from earth faults, not direct personal shock protection (that's the 30mA class). Type AC detection covers sinusoidal AC residual currents — fine for general-purpose circuits feeding socket outlets, lighting, and resistive loads, but not for inverter-fed or electronically smoothed loads that produce pulsating DC or high-frequency residuals. If the downstream load includes VFDs, LED drivers, or switched-mode supplies, a Type A or Type F RCD would be the correct choice. The 6kA breaking capacity (Icn) is the short-circuit current the device can safely interrupt. In most domestic and small commercial distribution boards the prospective fault current stays under 6kA, so this rating is adequate. If the board is close to a large transformer or in an industrial supply with higher fault levels, you'd need a 10kA or higher-rated unit. B-curve characteristic means the magnetic trip operates at 3-5 times rated current (75-125A for this 25A unit). That's the standard curve for residential and commercial lighting and socket-outlet circuits where inrush is modest. It's not intended for motor or transformer starting loads — those would need a C-curve or D-curve to avoid nuisance tripping on inrush.
Sourcing and lifecycle reality
Sourced to order against an RFQ through independent distribution. No minimum quantity constraints typical of factory-direct programs. Current pricing and lead time confirmed at quote time.