04.91.010-CE07 by KEB

The 04.91.010-CE07 is a compact rectifier unit produced by KEB within the COMBITRON Rectifiers series. Installed between the AC supply and a brake coil, it lets control panels energize magnetic actuators directly from the mains. By converting alternating voltage to steady direct current, the module helps drive clutch-brake assemblies, holding brakes, and other inductive loads at a stable DC level. Its slim body and screw terminals fit shallow panels and DIN-rail adapters used on conveyors and packaging systems.

Electrically, the rectifier accepts alternating input up to CE 500 VAC - UL 240 VAC and delivers a regulated output current of 1.2 A to the connected coil. It uses a half-wave circuit topology, so only one half of each mains cycle is conducted, reducing average DC while limiting heat in the brake. The internal network is rated for a coil voltage of 180 VDC, matching KEB spring-applied brakes. An enclosure classified as IP20 prevents accidental finger contact while still allowing ventilation for the embedded diodes. DC contact switching is provided, so the control relay can interrupt the DC side without additional components. A mounting hole pitch of 38 mm fits common back-panel grids, and the body measures 18 mm deep by 28 mm high, supporting dense layouts.

Operation in climatic class 3K3 means the module tolerates indoor industrial atmospheres with moderate humidity and airborne dust. When supply circuits are protected by a 5 A external fuse, semiconductor elements remain within their thermal limits during fault events. The housing spans 46 mm in width, so adjacent devices must respect the minimum terminal clearance of 9.5 mm to maintain dielectric strength. Wiring lugs are secured with a torque of 0.4 Nm, preventing loosening from vibration while guarding against thread damage in the plastic base.