Bussmann CH143DMSU-F Eaton's series 3-Pole modular fuse holder, rated at 690 V a.c./750 V d.c. (IEC), 700 V a.c. (UL), 50 Amps (IEC and UL), fitted with a microswitch, suitable for 14 x 51 mm Cylindrical fuses

DIN rail mounting, and it occupies 6 modular spacings of rail width. Overall body is 225 x 48 x 80 mm, so allow for the 80 mm height plus carrier swing when you plan the enclosure depth and wireway clearance.

50 A on both IEC and UL, with 690 V a.c./750 V d.c. to IEC and 700 V a.c. to UL. It is a three-pole holder, so it covers all three line conductors of a 3-phase circuit.

The -F suffix version is fitted with a microswitch, which gives you an auxiliary contact you can wire back to a PLC, contactor coil or alarm so the control system knows when the fuse carrier has been pulled. That is the reason to pick it over a plain holder. Note that it does not have optical (blown fuse) defect indication, so the microswitch is your status signal, not an LED.

No. It is a three-pole holder with no concurrently switching neutral pole, so it breaks L1, L2 and L3 only. If your design has to open the neutral at the same time, you need a 3P+N holder instead.

Yes, the holder is lockable, so the carrier can be secured for LOTO or to stop unauthorised re-fusing. Combined with the microswitch signalling carrier position, it suits maintenance procedures on machinery panels.

It is rated IP20, which is finger-protection against solid objects 12.5 mm and larger with no water protection. That makes it a panel-interior device, mounted inside a cabinet or behind a dead front. Do not use it in a wash-down, outdoor or dusty location without a suitable enclosure.

It is built to IEC 60269-2 and is CE marked, which is what a panel builder shipping into Europe needs on the fuse holder line. It also carries UL ratings at 700 V a.c. and 50 A for North American work.

The CH143DMSU-F is the holder only, a fuse accessory. You order the 14 x 51 mm cylindrical links separately, sized at or below the 50 A holder rating and within the 690 V a.c. IEC / 700 V a.c. UL limits.

The IEC rating covers 750 V d.c., so it is within spec for DC work at that level with an appropriately rated 14 x 51 mm link. The UL rating is a.c. only at 700 V, so for a UL-listed DC application check that the DC rating is acceptable to your listing authority.

161.5 g per holder, 48 mm wide across the rail (6 modular spacings), 80 mm high and 225 mm deep front to back. Useful numbers if you are laying out a crowded DIN rail or calculating shipping on a multi-panel order.