Battery Chargers and DC UPS Solutions

Powerbox PB358 Series Smart DC-UPS / Battery Charger - DIN Rail Mount

The Powerbox PB358 Series is a 138W smart DC-UPS and battery charger for DIN rail mounting, designed and manufactured in Australia. It keeps critical loads running from mains power and a backup battery, and is widely used in electronic security, access control, water utilities, telemetry and industrial control panels. Three models cover 12V, 24V...

Three models cover 12V, 24V and 48V lead-acid battery systems: PB358-12DIN-IEC (13.8Vdc, 10A), PB358-24DIN-IEC (27.6Vdc, 5A) and PB358-48DIN-IEC (55.2Vdc, 2.5A). AC input is 190 to 264Vac, connected by screw terminals or an IEC60320 C14 appliance inlet.

Charging is selectable between 2-step (bulk, float) and 3-step (bulk, absorption, float), with temperature compensation and current-limited charging. The Powerbox PB358 runs automatic and manual battery condition tests, checks battery connection and fuse integrity every five minutes, and protects the battery with low-voltage disconnect, an electronic circuit breaker for overload and over-temperature protection.

Voltage-free relay contacts report Mains OK, Rectifier OK, Battery OK and Fault status, matched by front-panel LEDs. An optional Ethernet interface adds remote monitoring and configuration through an embedded web server or SNMP.

Full rated output is available from 0°C to 50°C, derating linearly to 70°C, with natural convection cooling and conformal coating. The series complies with AS/NZS 60950.1 safety and AS/NZS CISPR 11 Class B EMC standards.

For other battery-backed options, browse our DC-UPS solutions and battery chargers, or contact our engineering team for help sizing the Powerbox PB358 to your load and battery.

Show Less

Select model number

Model:

or send a quick enquiry about this product only

Features

Trusted in Critical Applications: Widely utilised across Australia in electronic security and water utility applications, providing reliable, continuous DC power to access control systems, security peripherals, telemetry, monitoring equipment, and critical infrastructure control.
Versatile Installation Options: Designed for ease of integration, the PB358 Series features compact DIN rail mounting and offers a choice between screw terminal or IEC60320 C14 appliance inlet for AC mains input—providing flexibility and convenience for both field and panel-based installations.
Advanced Battery Management: Automatic and manual Battery Condition Testing (BCT), battery low-voltage disconnect, built-in electronic circuit breaker for battery overload protection, automatic battery connection and fuse integrity tests every five minutes, and battery over-temperature protection.
Intelligent Monitoring: Comprehensive alarm system featuring Mains OK, Rectifier OK, Battery OK, and Fault indicators with voltage-free relay contacts. Optional Ethernet interface available.
High Temperature Operation: Full-rated output operation from 0°C to 50°C with linear derating up to 70°C, suitable for harsh environments and natural convection cooling.
Australian Made: Proudly designed and manufactured in Australia, the PB358 Series reflects local engineering expertise and a deep understanding of industry requirements. Built to meet the demands of Australian conditions, it ensures high-quality performance, responsive technical support, and dependable supply chain continuity.

Specifications

INPUT
Input Voltage	190...264Vac, or 190...400Vdc
Input Current	1.4A max
Inrush current	15A on cold start
Frequency	45 to 65 Hz

ALARMS AND CONTROLS
RELAYS	Four voltage-free form-C contacts 32Vdc, 1A
Mains OK Relay	OK / Fail
Rectifier OK Relay	OK / Fail, overtemp or shutdown
Battery relays	Determined by DIP switch
	DIP switch 3 = OFF (Default)
Battery status relay	OK / Battery low voltage
	OK / Battery low voltage,battery disconnected or fuse fail, battery overvoltage,battery overtemperature or BCT Fail
Battery fault relay	DIP switch 3 = ONBattery disconnected or fuse fail, battery overvoltage, battery overtemperature or BCT Fail
	BCT in progress / not in progress
CONTROLS
External shutdown	Input for ext. voltage-free contact Closure reduces rectifier output voltage to 9.6V /19.4V / 39.1V
Control button	1s: clear BCT or bat discon. alarm 5s: manually start or abort BCT 10s: reset microcontroller
Battery start button	Closes battery low voltage disconnect switch. Allows load to be started from battery if mains power is not available.
LED's	Four green alarm / status LED’s
Mains and rectifier status	ON: Mains OK / OFF: Mains failON: Rectifier OK 0.5s flash: External shutdown 0.1s flash: Rectifier overtemp. prot’n OFF: Rectifier fail
Battery and BCT status	ON: Battery OK, charger = float 1s flash: Battery OK, charger = bulk 0.5s flash: Battery OK, charger = absorp. 0.2s flash: Battery OK, BCT pending0.1s flash: Battery OK, battery test or BCT OFF: Battery low voltage
Fault codes	Battery fault, 1-11 flashes in 5 seconds 1 flash: Battery disconnected or fuse fail 2 flashes: Battery overvoltage 3 flashes: Battery overtemperature 4 flashes: BCT fail
Fault LED	OFF: No faults
Fault codes	Battery fault, 1-11 flashes in 5 seconds 1 flash: Battery disconnected or fuse fail 2 flashes: Battery overvoltage 3 flashes: Battery overtemperature 4 flashes: BCT fail

OUTPUT - AC MAINS OPERATION
Output voltage	PB358-12DIN & PB358-12DIN-IEC: 13.8Vdc PB358-24DIN & PB358-24DIN-IEC: 27.6Vdc PB358-48DIN & PB358-48DIN-IEC: 55.2Vdc
Output Current (Total)	PB358-12DIN & PB358-12DIN-IEC: 10A PB358-24DIN & PB358-24DIN-IEC: 5A PB358-48DIN & PB358-48DIN-IEC: 2.5A
Line regulation	0.2% typ.
Load regulation	1.3% max.
Rectifier current limit*	Constant current > 6/7.5/15Vout Hiccup < 6/7.5/15Vout
Battery charging current limit	Constant current > LVD volts Front panel adjustable
Short circuit prot'n	Indefinite, autoresetting
Overvoltage prot'n	15.5-19.5V/31.5-39.0V/62.0-73.0V
Ripple & noise *	<50mVp-p/<100mVp-p/<100mVp-p
Efficiency*	86%/87%/ 88% typ. at 100% load* (13.8Vout / 27.6Vout / 55.2Vout)

BATTERY MANAGEMENT
Battery connections test	Battery connections & fuse tested automatically every 5 minutes
Battery charger	2 or 3 step selected by DIP switch 2
2 Step	Bulk / float
3 Step	Bulk / absorption / float
Parameters	Float voltage: 2.30 V/cell @ 25°C Absorption voltage: 2.40 V/cell @ 25°C Max. absorption time: 2 hours Absorption taper current: 4% Irated Absorption enable threshold: 2.00 V/cell
Battery overtemperature	50°C
Battery overvoltage alarm	2.50 V/cell, temperature compensated
Battery low voltage disconnect	1.75V/cell, 10 second delay
Battery overload protection	MOSFET switch in battery positive
Battery reverse polarity protection	Front panel fuse
Battery to load voltage drop	0.25V/0.13V/0.10V max. at 10A/5A/2.5A
Battery low voltage alarm	1.80 V/cell

SAFETY & STANDARDS
Safety	AS/NZS60950.1
Protection Degree	IP20
Protection against shock	Class I, with PE connection
EMC RF emissions	AS/NZS CISPR 11, Grp 1, Class B
Harmonic current	AS/NZS 61000.3.2
Isolation	Input to output: 4242Vdc, 1 min Input to ground: 2121Vdc, 1 min Output to ground: 707Vdc, 1 min

Selection Table

MODEL NUMBER	OUTPUT VOLTAGE	RATED TOTAL OUTPUT CURRENT¹	MAXIMUM LOAD CURRENT	BATTERY CHARGING CURRENT LIMIT	OUTPUT POWER
PB358-12DIN	13.8Vdc	10A	10A	0.5 to 10A Setpoint = 2.0A	138W
PB358-12DIN-IEC	13.8Vdc	10A	10A	0.5 to 10A Setpoint = 2.0A	138W
PB358-24DIN	27.6Vdc	5A	5A	0.2 to 5A Setpoint = 1.0A	138W
PB358-24DIN-IEC	27.6Vdc	5A	5A	0.2 to 5A Setpoint = 1.0A	138W
PB358-48DIN	55.2Vdc	2.5A	2.5A	0.1A to 2.5A Setpoint = 0.5A	138W
PB358-48DIN-IEC	55.2Vdc	2.5A	2.5A	0.1A to 2.5A Setpoint = 0.5A	138W

¹ Rated Total Output Current = sum of load and battery charging current.

Technical Drawings

Dimensions of a power box with connection terminals.

PB358-DIN series derating curve, showing power output versus ambient temp.

Downloads

PB358-DIN_SERIES-138W_PSU.pdf

PB358_SERIES_OPERATION_AND_INSTALLATION_MANUAL.pdf

Warranty & Returns

Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.

FAQs

What output voltage options are available in the PB358 Series?

The PB358 is available in 13.8Vdc (for 12V battery systems), 27.6Vdc (for 24V systems), and 55.2Vdc (for 48V systems), all at 138W rated output power, in a compact DIN rail-mounted form factor.

What is the difference between 2-step and 3-step battery charging on the PB358?

The PB358 supports selectable 2-step (bulk + float) or 3-step (bulk + absorption + float) charging. Three-step charging is generally preferred for lead-acid batteries as the absorption stage more fully charges the battery before float, improving capacity and reducing sulfation.

Does the PB358 include automatic battery testing?

Yes. It performs automatic battery condition testing and includes protection mechanisms that help detect battery faults, making it suitable for remote or unattended installations where regular manual inspection is impractical.

How can the PB358 be monitored remotely?

An optional Ethernet interface allows remote monitoring and configuration via an embedded web server or SNMP-compatible NMS. Local monitoring is available via alarm relays and LED indicators for DC OK and battery status.

What AC input connection options does the PB358 offer?

It supports both screw terminal AC input and an IEC60320 C14 appliance inlet, giving installers flexibility to wire directly or use a standard IEC cable depending on the enclosure or installation environment.

What safety and EMC standards does the PB358 comply with?

It is compliant with AS/NZS60950.1 safety and AS/NZS CISPR11 Class B EMC standards, making it appropriate for use in Australian security, telecommunications, and water utility applications.

Item added to your cart

Powerbox PB358 Series Smart DC-UPS / Battery Charger - DIN Rail Mount

Enquiry Cart

Your Details

Powerbox PB358 Series Smart DC-UPS / Battery Charger - DIN Rail Mount

Related Products