Surge Arrester Box -BT 5L CM 275/40 3+1

The Surge Arrester Box BT 5L CM 275/40 3+1 (840884) is designed for installation in LPZ 0B–1 or higher zones, providing effective surge protection for low-voltage equipment. It features a Class II SPD in a modular “3+1” circuit configuration, making it ideal for TT and TN-S power supply systems. This device helps prevent damage caused by transient overvoltages and conforms to international standards: IEC 61643-11, EN 61643-11, and GB/T 18802.11-2020.

Type

BT 5L CM 275/40 3+1
Art.-No.

840884
Features

1. Green light indicates normal and red light indicates fault for operation.
2. Bulit-in circuit breaker, and thermal disconnection device, when the fault occurred, the thermal disconnection device will cut off the SPD from the power net, the green window will change.
3. External wiring terminal, easy for connection, suitable for indoor application.
4. Impulse counter function, recording the lightning events.
5. Suitable for TT/ TN-S installations.
6. Suitable for use in three phase: 220V/380V(50/60 Hz), 230V/400V(50/60 Hz) AC systems.

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Location of Use:
Sub-Distribution Boards

System Type:
Three Phase, TN-S/TT

Mode of protection:
L-N; N-PE

Surge Ratings:
In=20kA/40kA(8/20μs)

High Surge Currents:
Imax=40/65kA(8/20μs)

A surge arrester Box is a protective enclosure housing surge protection devices designed to shield electrical systems from voltage spikes and transient overvoltages. Commonly used in residential, commercial, and industrial settings, it redirects excess energy from lightning strikes or power surges safely to the ground. The box ensures secure and weather-resistant installation, enhancing durability and performance. By preventing damage to connected equipment, the Surge Arrester Box plays a vital role in maintaining system reliability, safety, and longevity of electrical infrastructure.

Features

1. Class II Surge Protection: Provides reliable defense against transient overvoltages and switching surges.
2. Modular “3+1” Circuit Design: Ensures optimal protection for TT and TN-S power systems.
3. LPZ 0B–1 Installation: Suitable for installation at the boundary between external and internal lightning protection zones.
4. High Discharge Capacity: Effectively handles surge currents to protect downstream equipment.
5. DIN Rail Mountable: Easy integration into standard distribution boards or control panels.
6. Visual Status Indicators: Built-in indicators show the operational status for quick maintenance checks.
7. Remote Signaling Option: Supports connection to monitoring systems for real-time protection alerts (if available).
8. Standards Compliance: Designed in accordance with IEC 61643-11, EN 61643-11, and GB/T 18802.11-2020.

Safety

1. Thermal Disconnection Mechanism: Automatically disconnects the SPD in case of overheating to prevent fire hazards.
2. Overcurrent Protection: Built-in safeguards cut off power during excessive current flow to protect downstream equipment.
3. Flame-Retardant Housing: Made with high-quality, fire-resistant materials to enhance installation safety.
4. Short-Circuit Withstand Capability: Designed to safely manage fault currents during surge or failure events.
5. Visual Status Indicators: Provides real-time protection status for immediate fault detection and safe maintenance.
6. Optional Remote Signaling: Enables integration with monitoring systems for quick alerts during unsafe conditions.
7. Grounding Compatibility: Ensures secure connection to protective earth for safe diversion of surge energy.

Advantages

1. Protects Critical Equipment: Prevents damage to sensitive devices caused by lightning strikes and electrical surges.
2. Enhances System Reliability: Maintains stable and uninterrupted power supply in residential, commercial, and industrial settings.
3. Reduces Maintenance Costs: Minimizes the need for frequent repairs or replacements due to surge-related failures.
4. Easy to Install and Replace: Modular, DIN-rail mountable design simplifies installation and maintenance tasks.
5. Increases Equipment Lifespan: Reduces electrical stress on downstream systems, extending their service life.
6. Real-Time Monitoring (Optional): Remote signaling feature allows for immediate surge status alerts and system integration.

Installation

1. Select the Installation Point: Install the surge arrester box at the main distribution board or upstream of critical loads, typically between LPZ 0B and LPZ 1.
2. Power Off the System: Before installation, turn off the main power supply and ensure all circuits are de-energized.
3. Mount the Device: Attach the surge arrester box securely to the DIN rail inside the panel or cabinet.
4. Make Electrical Connections: Connect the Line (L), Neutral (N), and Earth (PE) terminals according to the wiring diagram, using short and thick wires to minimize impedance.
5. Tighten All Terminals: Ensure all connections are firm and secure to prevent loose contacts or overheating.
6. Connect Remote Signaling (if applicable): Wire the optional remote terminal to a monitoring or alarm system for real-time status updates.
7. Restore Power: Switch the main power supply back on and verify that the status indicators show normal operation.
8. Perform Routine Checks: Periodically inspect the visual indicators and wiring to ensure ongoing protection and device integrity.

Applications

1. Residential Buildings: Protects household electrical systems and appliances from surge-related damage.
2. Commercial Facilities: Secures office equipment, HVAC systems, and lighting from transient overvoltages.
3. Industrial Control Panels: Safeguards machinery, automation systems, and power distribution lines.
4. Power Distribution Boards: Installed at key points to provide surge protection in main or sub-panels.
5. Data Centers: Prevents downtime and protects sensitive IT infrastructure from power surges.
6. Telecommunication Systems: Shields base stations, routers, and network equipment from voltage spikes.
7. Renewable Energy Systems: Applied in solar and wind energy setups to protect inverters and power control units.
8. Public Infrastructure: Used in transportation systems, smart grids, and utility networks to ensure uninterrupted operation.

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Type	BT 5L CM 150/40 3+1	BT 5L CM 275/40 3+1	BT 5L CM 320/40 3+1	BT 5L CM 385/40 3+1
Art.-No.	840903	840884	840905	840906
According to IEC 61643-11/EN 61643-11	Class II / Type 2
Rated voltage (max. continuous voltage) [Uc]	150V(L-N)/255V(N-PE)	275V(L-N)/255V(N-PE)	320V(L-N)/255V(N-PE)	385V(L-N)/255V(N-PE)
Nominal discharge current (8/20μs) [In]	20kA(L-N)/40kA(N-PE)	20kA(L-N)/40kA(N-PE)	20kA(L-N)/40kA(N-PE)	20kA(L-N)/40kA(N-PE)
Max. discharge current (8/20μs) [Imax]	40kA(L-N)/65kA(N-PE)	40kA(L-N)/65kA(N-PE)	40kA(L-N)/65kA(N-PE)	40kA(L-N)/65kA(N-PE)
Voltage protection level at In [Up]	≤ 0.75kV(L-N)/ ≤ 1.5kV(N-PE)	≤ 1.25kV(L-N)/ ≤ 1.5kV(N-PE)	≤ 1.5kV(L-N)/≤ 1.5kV(N-PE)	≤ 1.8kV(L-N)/≤ 1.5kV(N-PE)
Response time [tA]	≤ 25ns(L-N)/≤ 100ns(N-PE)
Frequency range[Hz]	50~60 Hz
Follow current extinguishing capability at Uc[I_f]	100A_rms(N-PE)
Bulit-in back up fuse (MCB)	C32A
Bulit-in impulse counter	0-999，3 digits（Type：IC 03）
Operating temperature range [Tu]	-40°C…+80°C
Failure indication	Power： Green light ；Faulty：Red light
Cross-sectional area	10mm² ~25mm² solid /35mm² flexible
Mounting on	*Wall installation（4 M5 Screws fixing）**
Enclosure material	Black mater Enclosure
Degree of Protection	IP 20
Place of installation	Indoor
Compliance	IEC 61643-11:2011 ; EN 61643-11:2012; GB/T 18802.11-2020
Certification	CE; RoHS