Battery Module for Buffered DC Supplies
The Siemens 6EP1935-6MC01 is a 12-cell lead-acid battery module rated at 1.2 A·h, designed to buffer a 24 VDC power supply during line dips or short interruptions. It snaps onto a DIN rail EN 60715 35x7.5/15 or mounts via keyhole slots for M4 screws — no S7 rail compatibility, so plan for standard profile rail in the panel. Capacity derates with temperature: at 20 °C typical hold time is 4 a, dropping to 2 a at 30 °C, 1 a at 40 °C, and 0.5 a at 50 °C. That 1 a at 40 °C is the number to use if the enclosure runs warm — the 20 °C figure is a best-case for a cool cabinet.
Enclosure dimensions are 106 mm high, 96 mm wide, 108 mm deep — fits a standard 4-module-wide DIN-rail footprint. The screw terminals accept 0.08 to 2.5 mm² for the +BAT and -BAT connections; strip length per typical practice is 8 mm for a clean clamp. IP00 rating means no ingress protection — mount inside a closed cabinet, not in a washdown or dust-exposed area. The accessory pack includes a solid-state circuitry fuse rated at 7.5 A.
Charge Voltage and Temperature Compensation
The recommended charging voltage varies with ambient temperature to prevent over- or under-charging the lead-acid cells. At -10 °C the setpoint is 29 V; at 0 °C it is 28.4 V; at 10 °C it is 27.8 V; at 20 °C it is 27.3 V; at 30 °C it is 26.8 V; at 40 °C it is 26.6 V; at 50 °C it is 26.3 V. Maximum charging current is 0.3 A — the power supply driving this module must be current-limited to that value. Per the operating data note, DIN/VDE regulations (VDE 0510 Part 2 / EN 50272-2) apply for storage, mounting, and operation. The battery site must be ventilated, and ignition sources kept at least 50 cm away.
Approvals and Lifecycle Status
Typical capacity falls to 80 % of original capacity per EUROBAT guidelines — expect gradual fade over service life, not a sudden drop. The storage temperature range is -20 to +50 °C; operating range is -15 to +50 °C.