XH-M350 12V 12A 150W Backup Battery Automatic Switching UPS Module

XH-M350 12V 12A 150W Backup Battery Automatic Switching UPS Module is an automatic DC power-failure switchover module built around a high-current 12V electromechanical relay and heavy-duty screw terminal blocks. Designed for 12V DC systems up to 12A (150W), it powers your load normally from the primary 12V AC-DC adapter/SMPS and instantaneously switches the load over to a 12V backup battery the moment mains power fails—returning automatically to mains power once the primary supply is restored.

Key Features:

• Automatic Mains-to-Battery Switchover: Continuously monitors the primary 12V DC main input; when mains power drops out, the relay immediately transfers the 12V load to the backup battery terminals.
• High 12A / 150W Load Capacity: Industrial 12V SPDT power relay and wide PCB copper traces handle up to 12 Amps at 12V DC (150W) for routers, CCTV arrays, pumps, and lighting.
• Zero-Drop Relay Contact Conduction: Unlike diode OR-ing modules that waste 0.4V–0.7V across Schottky diodes, the relay contacts pass full 12V voltage with negligible contact resistance.
• Dual Status Indicator LEDs: Onboard red and green LEDs clearly indicate whether the load is running on Primary Mains DC or Backup Battery DC.
• Heavy-Duty 6-Pin Screw Terminals: Three clearly labeled 2-pin screw terminal blocks (Main Power Input, Backup Battery Input, and Load Output) make wiring effortless.

Technical Specifications:

• Model: XH-M350 Automatic Backup Battery Switch Module
• System Operating Voltage: 12.0V DC Nominal (11V to 14V DC)
• Maximum Switching Current: 12A Continuous
• Maximum Load Power: 150W (at 12V DC)
• Switching Element: High-Capacity 12V DC SPDT Electromechanical Power Relay
• Switchover Time: ~5 ms to 10 ms (Note: Add a 2200µF–4700µF 25V capacitor across the Load terminals if powering sensitive digital routers that require 0ms hold-up during relay contact travel)

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Blue Fiberglass Board
• Connectors: 3 × 2-Pin 5.08mm Cage Screw Terminal Blocks
• Mounting: 4 × Ø3.0 mm Corner Mounting Holes

Dimensions:

• Length: 54 mm
• Width: 26.6 mm
• Height: 19 mm
• Weight: ~23 g

Pinout and Wiring:

• Main Power Input (VIN+ / VIN-): Connect your primary 12V DC SMPS or wall adapter.
• Battery Input (BAT+ / BAT-): Connect your 12V backup battery (e.g. 12V 7Ah SMF lead-acid or 3S/4S lithium pack). Note: XH-M350 is a pure switchover module and does not charge the battery—pair with a 12V float charger if automatic charging is desired.
• Load Output (OUT+ / OUT-): Connect your 12V DC load (up to 12A / 150W).

Datasheet Reference:

• Circuit Architecture: 12V Coil Sensing SPDT Relay Transfer Switch (NO = Main Adapter, NC = Backup Battery, COM = Load Output)

Commonly Used in:

• 12V CCTV Camera, DVR, and Access-Control Door Lock UPS Systems
• Aquarium Air Pump & Incubator Heater Power-Cut Backup
• 12V Emergency LED Lighting & Security Siren Switchover
• Solar-to-Grid 12V DC Bus Automatic Transfer Switches

Applications:

• Keeps 12V CCTV security cameras, electromagnetic door locks, or incubator heaters running from a 12V lead-acid battery during mains blackouts.
• Switches between a 12V solar battery bank and a 12V mains SMPS automatically.
• Provides high-current 12A transfer capability with zero forward voltage drop.

Equivalent Models:

• YX850 5V-48V Power Failure Automatic Switching Standby Battery Module: Wide-voltage (5V–48V) version that also trickle-charges the standby battery when mains power is present.

Package Includes:

• 1 × XH-M350 12V 12A 150W Backup Battery Automatic Switching UPS Module