Siemens PSC-12M (S54430-C26-A1) — addressable, microprocessor-controlled main power supply and battery charger that gives a Cerberus PRO Modular panel primary regulated 24VDC power at 12 Amps in alarm and 5 Amps in standby, with a built-in charger for batteries up to 100AH.
The PSC-12M is the main system power supply, not a booster. It is a universal input supply accepting 120VAC to 240VAC at 50/60Hz with no configuration jumpers or taps to set. Because it is intelligent, it reports its own status to the Cerberus PRO Modular Operator Interface (Model FCM2041-U3), which can query it for system charging current, terminal loading, ground-fault conditions and more. Power and data reach the other cards through a 60-pin backplane connector carrying both 24VDC and 6.2VDC. The battery charger monitors the batteries automatically and selects between Bulk (full) charge, Trickle charge and Float (maintenance) states; battery size is declared in the Zeus-D configuration tool. The module mounts in one of four module spaces on the back box or on the optional CAB-MP mounting plate inside a CAB-1, CAB-2 or CAB-3 enclosure.
Specifications
| Part number |
S54430-C26-A1 |
| System output |
12 Amps @ 24VDC in alarm; 5 Amps in standby |
| Input voltage |
120VAC, 220VAC or 240VAC @ 50/60 Hz (universal input, no special configuration) |
| Input current, max. |
3.5A @ 120VAC; 2.5A @ 220VAC; 2.0A @ 240VAC |
| Screw-terminal 24V output |
Power limited 4.0A max.; non-power limited 12A max.; total not to exceed 12A |
| 24VDC backplane current |
2.0A max. |
| 6.2VDC backplane current |
2.0A max. |
| 24V standby current |
150 mA + 20 mA per active relay |
| Network output current |
Each HNET/XNET and CAN network pair: 8V peak-to-peak max.; 75 mA max. during message transmission |
| Relays |
Four Form C rated 2A each: common alarm, common trouble, and two programmable |
| Battery charging |
Up to 15AH, 31AH, 75AH and 100AH lead-acid batteries; Bulk, Trickle and Float charge states |
| Circuit protection |
Auto-resettable current protection on the 24VDC outputs for overload and short circuit; ground-fault detection circuitry |
| Operating environment |
32°F to 120°F (0°C to 49°C), relative humidity not greater than 95%, non-condensing |
| Mounting |
One of four module spaces on the back box or the optional CAB-MP plate, inside CAB-1, CAB-2 or CAB-3 enclosures |
| Bus connection |
60-pin power/data connector, two connection points |
| Listings |
UL 864 and CAN/ULC-S527 Listed, File S24304, Vol. 3 |
Installation notes
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Lead-acid only: the PSC-12M can only charge lead-acid batteries. Lithium or other chemistries are not supported by this charger.
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Declare the battery size in software: the battery capacity fitted to the panel is entered in the Zeus-D configuration tool, and the charger uses that to pick its charge state. Fitting a different battery without updating the configuration means the charger is working to the wrong profile.
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Two output terminals, one budget: the 4A power-limited terminal is for external use and the 12A non-power-limited terminal for internal use, but the combined draw must not exceed 12A.
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Expansion: up to three PSX-12M power supply extenders can be connected to one PSC-12M. The PSFA Power Supply Filter Assembly is required for applications with more than two PSX-12M extenders; a PSFA is included with the PSC-12M for AC field connections.
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Two supplies in one cabinet: holding two PSC-12M supplies in a single CAB-series enclosure requires the optional PSC-ISO-CBL extender cable (S54430-K4-A1).
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Standby current scales with relays: budget 150 mA plus 20 mA for each relay that is active when sizing standby battery calculations.
Related models
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PSX-12M (S54430-C27-A1) — power supply extender, 12A @ 24VDC; expansion only, with no backplane current and no battery charger
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PSFA (S54430-A13-A1) — power supply filter assembly, required beyond two PSX-12M extenders
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PSC-ISO-CBL (S54430-K4-A1) — extender cable for mounting two PSC-12M supplies in one CAB-series enclosure
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CAB-BATT (500-633917) — battery enclosure for 75AH or 100AH batteries that will not fit the panel cabinet
Specifications taken from the Siemens data sheet "Cerberus PRO® Power Supply Charger | Power Supply Extender | Power Supply Filter Assembly, Models PSC-12M | PSX-12M | PSFA," document 8302 (October 2023, Rev. 2). Manufacturer specifications are subject to change without notice.
