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 -...
Read MoreThe 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.
Now certified to the updated AS/NZS 61558.2.16 safety standard for general use, the PBB2S MK II Series meets the latest regulatory requirements for safe and compliant operation in commercial and industrial environments. It is fully compliant with AS/NZS 62368.1 and CISPR 32 Class B EMC standards, and is officially registered and approved under the EESS (Electrical Equipment Safety System) - Registration number: E2025004894.
Key Features:
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Separate, current-limited battery charging outputs
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Overcurrent, short-circuit, and overvoltage protection with latching shutdown
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Visual indicators and form-C relays for Mains/DC OK, Battery OK, and Battery Fuse Fail
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Lightweight, corrosion-resistant aluminium enclosure with natural convection cooling
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Self-resetting battery fuse and integrated overtemperature protection
Available in 13.8Vdc (3.25A and 6A) and 27.6Vdc (3.0A) versions, the PBB2S MK II supports both 12V and 24V battery systems and is ideal for low-voltage backup applications in security, automation, and infrastructure deployments.
The PBB2S MK II Series delivers enhanced safety, dependable performance, and installation continuity—making it a trusted solution for mission-critical power backup.
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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 Drawings
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.
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