Technical Engineering Insight
In life safety engineering, a fire alarm control panel (FACP) is only as dependable as its power supply equipment (PSE). Discover why global system integrators prioritize dual-path isolation, dynamic battery health monitoring, and zero-glitch switchover capabilities.
In modern commercial, industrial, and institutional infrastructure, fire alarm systems must operate flawlessly during grid stability as well as catastrophic main AC outages. The core component maintaining system integrity under all ambient conditions is the 24V Fire Panel Power Supply.
Unlike standard off-the-shelf commercial power supplies, a dedicated fire panel power supply (often referred to as an SMPS cum Battery Charger or Power Supply Equipment - PSE) must fulfill strict regulatory mandates set by international standards such as NFPA 72 (National Fire Alarm and Signaling Code) and EN 54-4 (Fire detection and fire alarm systems - Power supply equipment).
At Sanstar Microsystems Pvt. Ltd. (manufacturing under the trusted trade brand Micro Power), our engineering group in Nagpur, India has spent over 30 years refining switched-mode power supply (SMPS) topologies to deliver uncompromised DC output power, low ripple noise, thermal robustness, and extended battery service life for mission-critical fire safety loops.
Historically, fire alarm control panels relied on heavy linear transformers paired with crude trickle chargers. While mechanically simple, linear supplies suffered from high thermal dissipation, low efficiency (often below 60%), bulky footprints, and severe voltage droop under full notification appliance circuit (NAC) alarm load.
Modern fire safety installations demand high-frequency Switched-Mode Power Supplies (SMPS). By operating at switching frequencies between 65 kHz and 130 kHz, Micro Power's 24V Fire Panel Power Supplies achieve thermal efficiencies exceeding 88% while drastically reducing enclosure volume and copper weight. The table below provides a side-by-side engineering evaluation between standard power conversion units and specialized fire-grade SMPS chargers.
| Technical Metric | Standard Commercial 24V SMPS | Legacy Linear Power Supply | Micro Power 24V Fire Panel SMPS (FACP-Series) |
|---|---|---|---|
| Operating Efficiency | 75% – 82% | 50% – 60% | 88% – 93% (Energy Efficient) |
| Battery Backup Integration | External Diode Module Required | Basic Trickle Resistor | Built-in Dual Path with Instantaneous Seamless Transfer |
| Battery Health Supervision | None | None | Real-Time Dynamic Load Testing & Deep-Discharge Cutoff |
| Input Voltage Tolerance | 180V – 240V AC | 230V ± 10% AC | 90V – 300V AC (Wide Universal Input with Surge Protection) |
| Ripple & Noise (20MHz BW) | < 150 mVp-p | > 250 mVp-p | < 50 mVp-p (Prevents RF Interference on Loop Signaling) |
| Diagnostic Outputs | DC-OK LED Only | None | Form-C Relay Contacts: Mains Fail, Battery Fault, Charger Fail |
Product Selection Guide
Engineered by Sanstar Microsystems Pvt. Ltd. for addressable fire alarm panels, conventional alarm loops, smoke extraction dampers, and voice evacuation systems.
Compact, single-board power supply ideal for 2-loop and 4-loop fire alarm panels. Features automatic battery management, reverse polarity lock out, and deep discharge disconnect.
Space-saving DIN rail power supplies designed for modular integration inside auxiliary power extender cabinets and audio evacuation racks. Fully certified under BIS & CE standards.
Designed for high-rise buildings, airports, and industrial complexes requiring continuous DC availability. Combines two independent SMPS units with built-in diode ORing modules.
Industry Insights & Market Intelligence
How smart diagnostics, energy efficiency codes, Lithium Iron Phosphate (LiFePO4) chemistry, and IoT connectivity are reshaping life safety power infrastructure globally.
Traditionally, checking fire panel backup batteries required manual technician visits with load testers every 6 to 12 months. Global procurement specifications for commercial projects are now shifting towards IoT-enabled power supply equipment.
Next-generation 24V fire power supplies incorporate onboard microcontrollers that perform automated dynamic internal resistance (IR) checks on connected lead-acid or Lithium battery banks. By detecting cell degradation months before total failure occurs, facility managers receive preemptive warnings via BMS network protocols (Modbus, BACnet, or CANbus).
While Sealed Lead-Acid (SLA) and VRLA batteries have dominated fire alarm backup systems for decades, Lithium Iron Phosphate (LiFePO4) chemistry is rapidly gaining market share due to its 3x cycle life, higher energy density, and superior performance in elevated operating temperatures.
Micro Power’s forward-looking R&D team in Nagpur has introduced multi-stage programmable charging curves capable of handling both traditional float-charged VRLA banks and multi-cell LiFePO4 batteries equipped with integrated Battery Management Systems (BMS).
With green building certifications (LEED, BREEAM, GRIHA) gaining regulatory force across North America, Europe, and Asia-Pacific, fire protection systems must cut idle energy losses. Conventional power supplies lost up to 15W to 25W as heat during continuous 24/7 standby operation.
Advanced high-efficiency SMPS designs from Micro Power utilize resonant zero-voltage switching (ZVS) topologies, bringing standby power consumption below 1.5W while meeting strict EN 54-4 standby current budget constraints.
When specifying 24V fire panel power supplies for high-ambient locations (e.g., Middle East, Southeast Asia, India), ensure the manufacturer specifies thermal derating curves up to 60°C. Standard commercial SMPS units suffer severe thermal shutdown above 40°C, risking unannounced fire system failure during summer peak temperatures.
Get CatalogFrequently Asked Questions
Direct answers to the most common engineering, compliance, and purchasing questions asked by global fire system integrators.
Battery sizing for fire panels relies on mandatory standby and alarm duration specs mandated by local codes (such as NFPA 72 or EN 54). First, calculate the continuous quiescent standby current (I_standby) of all loop cards, detectors, and modules over 24 or 48 hours. Next, add the full alarm current (I_alarm) required for sounders, strobes, and relays for 5, 10, or 30 minutes. Apply a standard 20% battery aging safety factor: Total Ah = [(I_standby × Standby Hours) + (I_alarm × Alarm Hours)] × 1.20. Our engineering team can assist you in verifying your panel calculations.
A standard industrial 24V SMPS provides a fixed single DC rail (usually 24.0V) and lacks battery charging circuits, reverse polarity protection, and fault diagnostics. A specialized 24V Fire Panel Power Supply outputs a regulated 27.6V DC float voltage required to keep backup SLA batteries fully charged, features two isolated paths (load output and battery charger), and includes mandatory fault-reporting relays for Mains Fail and Battery Disconnect.
Yes. Sanstar Microsystems Pvt. Ltd. offers complete OEM/ODM design services under the Micro Power brand. We can customize output voltage setpoints (e.g., 27.2V to 28.4V), circuit board dimensions, mounting hole locations, terminal block orientations, wire harness integration, and custom diagnostic LED panels to match your specific FACP metal housing.
Micro Power 24V Fire Panel Power Supplies use diode-ORing / MOSFET ideal-diode bridge circuits between the main DC bus and the battery standby terminal. When primary AC mains power drops, the internal DC bus seamlessly transitions to battery power without a microsecond of drop-out, ensuring FACP microcontrollers and addressable SLC loops do not reset.
Every unit produced at our MIDC Hingna Road factory in Nagpur, India undergoes rigorous testing. Our product lines carry BIS (Bureau of Indian Standards) approvals, CE certifications, and UL recognized model options (such as our UL-certified 60W SMPS cum battery charger). 100% of manufactured units complete dynamic full-load burn-in testing prior to final quality dispatch clearance.
Long cable runs to remote notification appliance circuits (NAC) or beam smoke detectors introduce voltage drops (V_drop = I × R_cable). If the terminal voltage drops below 20.4V DC, strobes or sounders may fail to fire. Micro Power offers adjustable output voltage models (24V to 28.5V DC trim) and remote-sense terminals to compensate for long field cabling losses.
Enterprise & Factory Capability
Built on 30+ years of power electronics excellence, in-house R&D mastery, and uncompromising shop-floor quality control.
Over three decades of continuous innovation in high-density SMPS, DC UPS, and industrial battery charging solutions engineered in Nagpur, India.
Strict ESD control discipline across our MIDC Hingna Road plant guarantees component stress protection and long-term field reliability.
In-house incoming inspection screens 100% of capacitors, MOSFETs, and magnetic cores prior to PCB assembly, eliminating early mortality rate.
Complete transparency with documented type-test results, full-load thermal imaging, and active factory walkthrough videos on our channel.
Talk directly with our power supply design engineers in Nagpur, India. We offer technical datasheet reviews, sample evaluation units for OEM testing, and competitive volume pricing.