

SPD (Surge Protection Device)
A Surge Protection Device (SPD) is an electrical device designed to protect electrical equipment and systems from transient voltage surges caused by lightning strikes, switching operations, or other electrical disturbances. SPDs divert excess voltage safely to the ground, preventing damage to sensitive equipment in residential, commercial, and industrial installations. They are essential for safeguarding electrical panels, machinery, communication systems, and renewable energy installations.
- Description
Description
Product Range / Variants
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Type 1 SPD (Main Lightning Protection)
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Type 2 SPD (Secondary Protection for Distribution Panels)
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Type 3 SPD (Point-of-Use Protection for Equipment)
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AC Surge Protectors
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DC Surge Protectors
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Single-Phase SPDs
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Three-Phase SPDs
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Modular / DIN Rail Mountable SPDs
Key Features
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Protects against voltage surges and transient overvoltages
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Fast response time for efficient protection
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High discharge capacity for industrial applications
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Visual indicators or remote signaling for operational status
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Compact and DIN rail or panel mountable design
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Compatible with AC and DC systems
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Reduces downtime and equipment damage
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Flame-retardant and robust construction
Technical Specifications
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Nominal Voltage: 110V – 1000V AC/DC (depending on type)
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Max Discharge Current (Imax): 10kA – 100kA (model dependent)
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Voltage Protection Level (Up): ≤ 1.5kV – 2.5kV
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Response Time: <25 ns
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Poles: Single-Pole, Multi-Pole (1P, 2P, 3P, 4P)
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Frequency: 50Hz / 60Hz
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Standards Compliance: IEC 61643-11, IS 14897, UL 1449
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Operating Temperature: -40°C to +80°C
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Mounting Type: DIN Rail, Panel Mount
Applications
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Electrical distribution boards and panels
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Industrial machinery and automation systems
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Residential and commercial electrical installations
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Renewable energy systems (solar inverters, wind turbines)
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Communication and IT equipment protection
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HVAC and building automation systems
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Power supply and UPS systems
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Substations and switchgear installations
Benefits
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Protects electrical and electronic equipment from surges and transients
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Enhances reliability and longevity of devices and systems
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Reduces downtime due to electrical faults
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Easy installation in panels or DIN rails
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Compact, durable, and maintenance-friendly design
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Supports both AC and DC circuits
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Provides visual or remote indication for operational status
Material Grades / Build Options
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Housing: Flame-retardant ABS, Polycarbonate, or Thermoset Plastic
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Surge Components: Metal Oxide Varistors (MOV), Gas Discharge Tubes, or Hybrid Technology
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Mounting Options: DIN Rail Mount, Panel Mount, Modular Units
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Poles: 1P, 2P, 3P, 4P
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Voltage / Current Ratings: Customizable per application
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Indicators: LED, Mechanical Flag, or Remote Signal Output
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Standards Compliance: IEC, IS, UL certified

SPD (Surge Protection Device)
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