Siemens 6EP4438-7FB00-3DX0 SITOP SEL1200 8x2-10A Power Supply Selectivity Module

Siemens 6EP4438-7FB00-3DX0 is a SITOP SEL1200 8-channel selectivity module that splits a single 24 V DC, 60 A supply into eight individually protected 2-10 A outputs, each adjustable via potentiometer. It isolates a fault on one branch circuit without tripping the upstream supply, using a three-color LED per output and a floating signal contact for remote diagnostics.

Technical Specifications

Certifications & Standards

• CE
• UL 2367
• cULus (UL 508)
• UKCA
• EAC
• CB
• DNV
• EPD

Selection Notes

Each of the 8 outputs trips independently on overcurrent (Iout greater than 2.0x set value clears in about 30 ms; Iout greater than 1.0x set value clears in about 5 s), so a shorted branch drops only that channel instead of pulling down the shared 24 V bus - pick this over a single large-frame breaker when a machine has multiple independent 24 V DC sub-circuits that must fail separately. The per-channel threshold is field-adjustable 2-10 A via potentiometer, so the same module covers mixed loads (sensors on 2 A, valve banks on 8-10 A) without needing separate fixed-current modules. A DIN-rail width of only 45 mm keeps cabinet footprint small for 8 protected outputs.

Applications

Used downstream of a bulk 24 V DC power supply to give each machine zone, sensor group, or actuator bank its own selectively protected output, so a single shorted branch does not shut down the whole control cabinet.