SR500L – SR750L

AC/DC Power Supplies – Battery Chargers 500W – 750W

The SRL models are designed for use as a precision AC to DC power supply, or a float charger for lead acid batteries. Note that for float charging the output voltage must be set to approximately 15% above the nominal battery voltage. The SRL series can have an optional ethernet, RS485 or RS232 communications port fitted.


  • Industrial quality AC/DC power supply
  • Standalone – benchtop or fixed mounting
  • Front panel controls & indication
  • Suitable for float charging of lead-acid batteries
  • Suitable for parallel operation
  • Conservative design for long life
  • Precise voltage and current control

Optional Features

  • American Input Voltage 110VAC ( 88 – 135VAC)
  • Communication Port ( RS232 ASCII – SR485 – MODBUS RTU  – SNMP , webpages)
  • Mounting:  Rack Mount 19″ with V/I meter available, Wall mount
  • N+1 redundancy
  • Boost Charger
  • Optional temperature compensation for charging
  • Optional relay alarm outputs
  • Optional DC input


  • Security – Access Control
  • Industrial Processes Switching Protection
  • Radio Repeaters – Remote Sites

Accessories Supplied

  • Mounting feet together with screws
  • AC power cord 1.5m with IEC320 socket and NZ/Aust plug
  • Mating screw-terminal plug for alarm outputs
  • Crimp lugs for stud terminal versions
  • DC screw terminal plug-in connector for ‘X’ version




 ModelOutput (V) Output (A)Power (W)
SR500L1213.836.2 (41.6 @ 12V)500
SR750L1213.836.2 (41.6 @ 12V)750


Input180V – 264V ( 88V-132VAC option)
FusingInternal AC input fuse
Overcurrent protectionConstant current limit under overload and short circuit conditions (except DC input versions which have primary current limit)
Isolation1KV DC input – output / earth
Efficiency> 85%
Hold-up time15 – 20 ms without batery
AlarmsMains fail (or PSU in standby mode)
DC low (Battery low or PSU low) – set at 92% of nominal voltage.
DC high
Alarm  relay contactsC – NO – NC changeover rated 1A /50V DC, 32VAC
AC Input ConnectorIEC320 inlet socket
CommsChoice of RS485 ,RS232, Ethernet
ProtocolsSNMP v1 or Modbus (external converter)
Dimensions146.5 W x 62 H  x 177 D mm (SR100L) , 150W x 61H x 242D (SR250L)
Weight0.94Kg (SR100L) , 1.7Kg(SR250L)
Operating temperature0 – 50 °C ambient at full load De-rate linearly >50 °C to no load @ 70 °C
Storage temperature -10 to 85 °C ambient
Humidity0 – 95% relative humidity non-condensing
CoolingFan cooled
EmiTo CISPR 22 / EN55022 class A
SafetyTo IEC950 / EN60950 / AS/NZS3260

Custom Solutions

CAB365 Wall Mount Battery Charger 750W 24VDC with digital meter and alarm card and DC Distribution


CAB365 is a 750W 24VDC redundant battery charging system in a 12U 19-inch wall mount cabinet. The system comprises of two SR750L24FSL in 2U 19” sub-racks with a 50A decoupling diode, Digital V/I meter and Alarm card and LVD for protection. The system is set to provide 27.2VDC at the output of the decoupling diodes to float charge the batteries and provide the load. The output voltages of the SR750L24FSL’s are front adjustable with a variable potentiometer on the front of the chargers.

The AC input of a charger is protected with a 6A AC Input MCB and the output of the 2U chargers is protected with 32A 2P MCB. A P50 diode in the positive output of the chargers ensures redundancy configuration of the chargers in the system. The system output is monitored with a Digital V/I meter and Alarm Card and a LVD controlled by the Alarm Card disconnect the load if the battery voltage drops to 22VDC. A 63A load isolator ensures isolation of the load from the chargers and battery. A 63A single pole battery breaker protects the battery and the system is also equipped with an Emergency 24VDC Input connection on WDU10 terminals which is protected with a 63A single pole Emergency Input MCB.

Features of CAB365 include

  •  750W 24VDC Redundant charger in a 12U 19” wall mount cabinet
  • Charger output voltage front adjustable on chargers
  • 2 x 32A 2P Charger Output Breakers
  • 63A 1P Battery Breaker
  • Emergency 24VDC Input with 63A 1P Breaker
  • 63A 1P Load Isolator
  • Digital V/I meter
  • Low Voltage Disconnect set at 22VDC
  • Various Charger and System alarms
  • DIN rail Alarm terminals with links

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