Battery Chargers

Powerbox PBB2S MK II SERIES DC-UPS Battery Charger

The Powerbox PBB2S MK II Series DC-UPS Battery Charger is purpose-built for security and access control systems, delivering reliable DC power and uninterrupted battery backup for critical security equipment. Engineered for high efficiency and field-proven reliability, the PBB2S MK II Series is a direct replacement for the original PBB2S models - offering full backward compatibility for existing installations by maintaining the same electrical performance, mechanical footprint, and mounting points.

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Powerbox PBB3S-SERIES AC/DC Power Supply

Features

  • Designed for critical backup power in security and access control systems: The PBB2S MK II is purpose-built to deliver uninterrupted DC power and battery charging for systems requiring high availability, including CCTV, electronic locks, and intrusion detection.
  • Available in 13.8Vdc (3.25A and 6A) and 27.6Vdc (3.0A): Three model variants support both 12V and 24V lead-acid battery systems, providing flexibility for a range of low-voltage standby applications across different installation types.
  • Certified to AS/NZS 61558.2.16 and AS/NZS 62368.1 standards: Complies with updated safety regulations for general use, ensuring suitability across commercial, industrial, and security applications, with full EMC compliance to CISPR 32 Class B.
  • Registered and approved under EESS - Reg. No. E2025004894: Fully compliant with Australian and New Zealand Electrical Equipment Safety System requirements, simplifying compliance for installers, specifiers, and electrical inspectors.
  • Backward compatible with original PBB2S Series mechanical layout: Designed with matching physical dimensions and mounting points, allowing for simple retrofit or replacement in existing enclosures without design modification or rewiring.
  • Integrated safety, diagnostics, and low-maintenance operation features: Includes output overvoltage and overcurrent protection, battery reverse polarity protection, LED and form-C relay indicators, natural convection cooling, and a self-resetting battery fuse.
Specifications
INPUT
Nom. Input Voltage  115 / 240Vac
Input Voltage Range  90...264Vac
Nominal Frequency 50/60Hz
Input Current

PBB2S-13-3.5 MKII: 1.7A

PBB2S-13-7 MKII: 2.3A

PBB2S-28-3.5 MKII: 2.3A
OUTPUT - AC MAINS OPERATION 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Output Voltage  13.8Vdc 13.8Vdc 27.6Vdc
Output Current  3.25A 6.0A 3.0A
Ripple & Noise¹  <120m Vp-p <120m Vp-p <150m Vp-p
Short Circuit Protection Hiccup, Non-Latching 
Overload Protection Hiccup, Overcurrent Protection <175% of Rated Current

Overvoltage Protection

 Shutdown, Latching: 16.5V - 21V  Shutdown, Latching: 33.0V - 40.5V 

Notes 

 ¹BW = 20MHz, AC coupled, measured in parallel with a 0.1 μF ceramic capacitor and a 47μF electrlytic capacitor.
BATTERY - EXTERNAL 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Chemistry   Lead Acid 
Battery Voltage  12V Battery (13.8Vdc Float) 12V Battery (13.8Vdc Float) 24V Battery (27.6Vdc Float)
Charger Type  Current Limited, Taper Charger 
Battery Charging Current Limit²  0.25A 0.5A 0.35A

Notes 

 ² Measured at 10.V or 20.0V (12V or 24V battery), T=25°C
OUTPUT - BATTERY OPERATION 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II

Voltage Drop 

(Typ. Battery to Output)

 0.47Vdc 0.55Vdc 0.47Vdc 
Short Circuit Protection  Yes - via self-resetting battery fuse 
Battery Reverse Polarity Protection  Yes - Indefinite 
DISPLAY / ALARMS 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Mains / DC OK  Green LED: ON = OK
Form-C Contact, 30Vdc/7A
Battery OK  Green LED:
OFF = Vbatt <10.5V
ON = Vbatt >11.5V
Form-C Contact, 30Vdc/7A		 Green LED:
OFF = Vbatt <21.0V
ON = Vbatt >23.0V
Form-C Contact, 30Vdc/7A
Battery Fuse Fail  Red LED: ON = FAIL
STANDARDS 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Safety  AS/NZS 61558.1; AS/NZS 61558.2.16; AS/NZS 62368.1
Short Circuit Protection SMPS incorporating a short-circuit-proof safety isolating transformer
Electric Shock Protection Class I
Overvoltage Category II
Pollution Degree 2

Isolation

Input to Output - 4.0 kVac, 1min

Input to Ground - 2.0 kVac, 1 min

Output to Ground - 500 Vac, 1 min

Alarms to Output and Grounding - 500 Vac, 1min
EMC AS/NZS CISPR 32 Class B
MECHANICAL AND ENVIRONMENTAL 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Case Size  219 x 115 x 62mm (LxWxH)
Weight  600g 670g 670g
Operating Temperature  -10°C ≤ T ≤ 70°C
Output Power D-Rating  -2.9% / °C for T ≥ 40°C
Cooling  Via Natural Convection 
Overtemperature Protection  Shutdown - Latching 

Protection Index 

IP20
Environment For indoor use only 
Selection Table
SELECTION TABLE 
Model Number  Output Voltage  Output Current  Battery Voltage  Battery Charge Current Limit 
PBB2S-13-3.5 MK II 13.8Vdc 3.25A 12Vdc 0.25A Typ 
PBB2S-13-7 MK II 13.8Vdc 6.0A 12Vdc 0.5A Typ 
PBB2S-28-3.5 MK II 27.6Vdc 3.0A 24Vdc 0.35A Typ
Technical Illustrations
Technical drawing showing dimensions of an electrical enclosure. Wiring diagram of a battery backup system.
Downloads
Powerbox_PBB2S_MKII_Series_DC_UPS_Datasheet.pdf
PBB2S_MK_II_SERIES_OPERATION_AND_INSTALLATION_MANUAL.pdf
INPUT
Nom. Input Voltage  115 / 240Vac
Input Voltage Range  90...264Vac
Nominal Frequency 50/60Hz
Input Current

PBB2S-13-3.5 MKII: 1.7A

PBB2S-13-7 MKII: 2.3A

PBB2S-28-3.5 MKII: 2.3A
OUTPUT - AC MAINS OPERATION 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Output Voltage  13.8Vdc 13.8Vdc 27.6Vdc
Output Current  3.25A 6.0A 3.0A
Ripple & Noise¹  <120m Vp-p <120m Vp-p <150m Vp-p
Short Circuit Protection Hiccup, Non-Latching 
Overload Protection Hiccup, Overcurrent Protection <175% of Rated Current

Overvoltage Protection

 Shutdown, Latching: 16.5V - 21V  Shutdown, Latching: 33.0V - 40.5V 

Notes 

 ¹BW = 20MHz, AC coupled, measured in parallel with a 0.1 μF ceramic capacitor and a 47μF electrlytic capacitor.
BATTERY - EXTERNAL 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Chemistry   Lead Acid 
Battery Voltage  12V Battery (13.8Vdc Float) 12V Battery (13.8Vdc Float) 24V Battery (27.6Vdc Float)
Charger Type  Current Limited, Taper Charger 
Battery Charging Current Limit²  0.25A 0.5A 0.35A

Notes 

 ² Measured at 10.V or 20.0V (12V or 24V battery), T=25°C
OUTPUT - BATTERY OPERATION 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II

Voltage Drop 

(Typ. Battery to Output)

 0.47Vdc 0.55Vdc 0.47Vdc 
Short Circuit Protection  Yes - via self-resetting battery fuse 
Battery Reverse Polarity Protection  Yes - Indefinite 
DISPLAY / ALARMS 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Mains / DC OK  Green LED: ON = OK
Form-C Contact, 30Vdc/7A
Battery OK  Green LED:
OFF = Vbatt <10.5V
ON = Vbatt >11.5V
Form-C Contact, 30Vdc/7A		 Green LED:
OFF = Vbatt <21.0V
ON = Vbatt >23.0V
Form-C Contact, 30Vdc/7A
Battery Fuse Fail  Red LED: ON = FAIL
STANDARDS 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Safety  AS/NZS 61558.1; AS/NZS 61558.2.16; AS/NZS 62368.1
Short Circuit Protection SMPS incorporating a short-circuit-proof safety isolating transformer
Electric Shock Protection Class I
Overvoltage Category II
Pollution Degree 2

Isolation

Input to Output - 4.0 kVac, 1min

Input to Ground - 2.0 kVac, 1 min

Output to Ground - 500 Vac, 1 min

Alarms to Output and Grounding - 500 Vac, 1min
EMC AS/NZS CISPR 32 Class B
MECHANICAL AND ENVIRONMENTAL 
  PBB2S-13-3.5 MK II PBB2S-13-7 MK II PBB2S-28-3.5 MK II
Case Size  219 x 115 x 62mm (LxWxH)
Weight  600g 670g 670g
Operating Temperature  -10°C ≤ T ≤ 70°C
Output Power D-Rating  -2.9% / °C for T ≥ 40°C
Cooling  Via Natural Convection 
Overtemperature Protection  Shutdown - Latching 

Protection Index 

IP20
Environment For indoor use only 
SELECTION TABLE 
Model Number  Output Voltage  Output Current  Battery Voltage  Battery Charge Current Limit 
PBB2S-13-3.5 MK II 13.8Vdc 3.25A 12Vdc 0.25A Typ 
PBB2S-13-7 MK II 13.8Vdc 6.0A 12Vdc 0.5A Typ 
PBB2S-28-3.5 MK II 27.6Vdc 3.0A 24Vdc 0.35A Typ
Technical drawing showing dimensions of an electrical enclosure. Wiring diagram of a battery backup system.
Powerbox_PBB2S_MKII_Series_DC_UPS_Datasheet.pdf
PBB2S_MK_II_SERIES_OPERATION_AND_INSTALLATION_MANUAL.pdf

Find the Right Model

Model Number Input Voltage (Vac) Output Voltage (Vdc) Output Current (A)
product variant PBB2S-13-3.5 MK II 90...264Vac 50/60Hz 13.8Vdc 3.25A
product variant PBB2S-13-7 MK II 90...264Vac 50/60Hz 13.8Vdc 6.0A
product variant PBB2S-28-3.5 MK II 90...264Vac 50/60Hz 27.6Vdc 3.0A

Need help finding the right product model?

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