CB Approved Singi Miniature Circuit Breaker ELCB RCBO with Overload Protection 100A

What a lot of facility managers are setting up now are these modular distribution boards for mixed-use buildings, where one tenant's machinery could easily pull 80A on a three-phase circuit while another needs sensitive 30mA earth leakage protection for human safety, and this model actually handles both sides of that without needing separate devices.

Breaking capacity sits at 10kA with the 100A rating, which is pretty much the sweet spot for most industrial panel builds we see—you're not overpaying for 25kA you don't need, but it's better than the 6kA stuff that can nuisance-trip on larger motor starts, and the Type D curve handles those inrush currents cleanly, though we usually have stock on 63A and 80A as well.

You'll want to pay attention to the pole configuration though—we've had buyers order the 3P+N variant assuming they could use it on a straight three-phase three-wire system, but what it actually does is ship with a switched neutral (usually 2-4 weeks lead time for that config), so if you're doing an older 3-wire installation the 3P version is teh one you need.

Housing material is the standard PA66 flame retardant with IP20 rating—basically no different from any other DIN rail module you've handled, but one thing that caught a colleague off guard is the 50mm² terminal capasity, which is way bigger than the 35mm² you'll find on cheaper units (especially handy for paralleling feed-throughs or oversized aluminim tails).

Mechanical life is rated at 10,000 operations and electrical at 4,000, but honestly in practice the tripping mechanism starts feeling slightly smoother after about 500 cycles or so—it's not something you'd typically wear out in a commercial setting where the breakers see maybe 50 operations a year, but for frequent-switching application like welding bays you'd want to derate current or check the contact wear.

Residual current options run from 30mA up to 300mA, and we've found most buyers with general sub-distribution boards go with the 100mA setting to avoid nuisance tripping from older equipment while still meeting the 300mA fire protection threshold, though the 30mA Type A versions work better for circuits feeding directly to sockets or bathroom zones.