DNU1 Type 2 SPD 275-550V AC 4P DIN-Rail Mount Manufacturers

Test Category：

T2/II/C

SPD per IEC 61643-11：

Class II

SPD per EN 61643-11：

Type 2

Max. Continuous Operating Voltage (Uc) [V AC]：

275, 385, 440, 460, 550

Nominal Discharge Current (In) [kA]：

10,20,30,40

Max. Discharge Current (Imax) [kA]：

20,40,60,80

Pole Configuration：

1P, 2P, 3P, 4P

Recommended SPD Backup Protector [kA(In)]：

10 kA(In)，20 kA(In)，30 kA(In)，40 kA(In)

Recommended Backup Fuse (gL)：

50 A,100A,125A,160A

Recommended Backup Circuit Breaker：

25A~100A

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Description

What is a type 2 SPD?

The DNU1 Series type 2 SPD is a modular surge protector designed for low-voltage distribution systems (up to 1000 V) in industries such as telecommunications, rail, oil & gas, and high-rise buildings. It safeguards electrical equipment from voltage spikes caused by lightning or switching events.

Under normal operation, the SPD is inactive; however, during a surge, the device instantly (<25 ns) conducts and diverts excess voltage to ground, thereby protecting downstream equipment.

The DNU1 meets IEC/EN 61643-11 (Type 1+2) safety standards. Ensuring reliable compliance and high safety in service.

Technical Parameter

Specification	DNU1-C20	DNU1-C40	DNU1-C60	DNU1-C80
Test Category	T2/I/C	T2/I/C	T2/I/C	T2/I/C
SPD per IEC 61643-11	Class II	Class II	Class II	Class II
SPD per EN 61643-11	Type 2	Type 2	Type 2	Type 2
Max. Continuous Operating Voltage (Uc) [V AC]	275, 385, 440, 460, 550	275, 385, 440, 460, 550	275, 385, 440, 460, 550	275, 385, 440, 460, 550
Nominal Discharge Current (In) [kA]	10	20	30	40
Max. Discharge Current (Imax) [kA]	20	40	60	80
Impulse Current (imp, 10/350 μs) [kA]	–	–	–	–
Voltage Protection Level (Up) [kV]	1.3, 1.6, 2.0, 2.5	1.3, 1.6, 2.0, 2.5	2.0, 2.5, 2.8	2.5, 2.8
Pole Configuration	1P, 2P, 3P, 4P	1P, 2P, 3P, 4P	1P, 2P, 3P, 4P	1P, 2P, 3P, 4P
Recommended SPD Backup Protector [kA(In)]	10 kA(In)	20 kA(In)	30 kA(In)	40 kA(In)
Recommended Backup Fuse (gL)	50 A	100 A	125 A	160 A
Recommended Backup Circuit Breaker	25A~32A	32A~63A	63A~100 A	63 A~100 A

Additional Parameters

Parameter	Value
Status Indicator	Green (OK)/Red (Defect)
Alarm Method	Remote Signaling (Optional)
Response Time	≤25 ns
Enclosure Protection Rating	IP20
Protection Mode	1-4P+L/N-PE
Structure Type	Plug-in
Mounting	35 mm standard rail
Wire Section for Remote Signaling Terminal	1.5 mm² (C: Common, NO: Normally Open, NC: Normally Closed)
Terminal Connection (Copper Conductor)	Multi-core: 1.5 mm² ~ 25 mm²Single-core: 1.5 mm² ~ 35 mm²
Torque	Terminal: 2.5 N·mRemote Signaling Interface: 0.25 N·m
Remote Contact Operating Parameters (Max.)	AC: 250 V/0.1 A, 125 V/1 ADC: 250 V/0.1 A, 125 V/0.2 A, 75 V/0.5 A

Operating Conditions

Condition	Value
Ambient Temperature	-40°C ~ +80°C
Relative Humidity	≤95% (at room temperature)
Altitude	≤3000 m
Installation Requirements	No significant vibration or shock; Tilt angle relative to vertical plane ≤5%; Avoid explosive atmospheres or environments with corrosive gases/dust (including conductive dust)

Certificate

DNU1 Type 2 SPD Key Features

Plug-in Modular Design: Snap-in cartridge design (with reusable base) allows tool-free installation and easy replacement.
LED Status Indicator: A built-in green/red LED window displays the protection status at a glance (green = OK, red = fault).
Remote Alarm Contact: Optional dry-contact output (remote signalling) for fault monitoring and integration into building management systems.
High Surge Capacity: Handles large surges (nominal discharge currents ~10–25 kA, peak currents up to ~40–50 kA) depending on model.
Ultra-fast Response: Clamps transient overvoltages in nanoseconds (<25 ns) to block spikes before they damage equipment.
Compact DIN-Rail Mount: Slim 35 mm DIN-rail housing saves panel space; miniaturized design matches standard breaker width.
Certified Protection: Complies with IEC/EN standards (Class I+II, Type 1 & 2) for guaranteed performance and safety.GB/T18802.11、IEC61643-11、YD/T1235.1(2)

What sets Type 1 and Type 2 Surge Protection Devices (SPD) apart from each other?

Type 1 Surge Protective Devices (SPDs) are installed before the main service entrance, typically between the power transformer and the building’s main distribution panel. They are designed to handle high-energy lightning strikes and other external surges, and can operate without requiring an upstream overcurrent protection device. Type 1 SPDs are ideal for whole-house or building-wide protection, especially in regions prone to direct lightning exposure.

Type 2 SPDs, on the other hand, are installed after the main breaker, inside the distribution panel. They are optimized for protecting downstream electrical systems from switching surges, such as those caused by motors, HVAC units, and industrial equipment. Type 2 SPDs are the most commonly used in residential, commercial, and industrial electrical panels.

In short, Type 1 SPDs offer primary protection from external surges, while Type 2 SPDs provide secondary protection within the system. For comprehensive safety, many electrical systems use both types in combination.
This has led to the development of Type 1+2 surge protective devices, which combine the high-energy handling capabilities of Type 1 SPDs with the precise, responsive protection of Type 2 SPDs in a single, compact unit. Type 1+2 SPDs are ideal for installations where both direct lightning protection and internal surge suppression are required, such as in residential main panels, industrial control cabinets, and solar PV systems. This SPD simplifies installation, reduces space requirements, and ensures full-spectrum protection from both external and internal transient events.

Feature	Type 1 SPD	Type 2 SPD
Installation Location	Before main breaker (service entrance)	After main breaker (inside distribution panel)
Purpose	Protection against external surges (e.g. lightning)	Protection against internal surges (e.g. switching)
Lightning Protection	Yes	No (limited lightning protection)
Switching Surge Protection	Moderate	Excellent
Upstream Overcurrent Protection	Not required	Required
Typical Applications	Whole house, industrial buildings	Distribution boards, subpanels, machinery
Best Used For	Primary protection	Secondary protection