Item No.: LY1-B25/1(S)

LY1-B25/1(S)MONOBLOCK SINGLE-POLE SPD

Description：

Classl·Classll·Type 1 .Type 2
Location of Use: Main Distribution Boards
Network Systems: TN-S, TN-C, TT
Mode of Protection: L-PE/N-PE
Surge Ratings: Limp= 25 kA (10/350 μs)
Ln= 25 kA (8 /20 μs)
lEC/EN Category: Class l+ll /Type 1+2
Protective Elements: High Energy MOV
Housing: Monoblock Design
Compliance: lEC 61643-11:2011
EN 61643-11:2012

As a professional AC surge protective device manufacturer, we supply high-quality 100kA 1 pole SPD designed for industrial and residential power systems. This model uses advanced graphite arc gap and MOV ZnO materials, providing superior lightning and surge protection performance.
Our SPD is built with PVC/PA66/PBT flame-retardant housing and fully complies with IEC 61643-11:2011 / EN 61643-11:2022 standards. Certified with CE and TUV, it ensures reliability and durability even under harsh environments.

As a factory-based OEM/ODM supplier, we offer wholesale, bulk buy, and in bulk orders for distributors worldwide. Choose our 100kA 1 pole AC surge protective device to enhance the stability and safety of your power distribution systems.

Applicable scenarios / Application industries

The product supports 35mm DIN rail installation, ideal for AC power systems, solar inverter panels, and combiner boxes.

■ Technical Data
IEC Electrical		150	275	320	385	440
Nominal AC Voltage (50/60Hz)	Uo/ Un	120 V	230 V	230 V	230 V	400 V
Maximum Continuous Operating Voltage (AC)	Uc	150 V	275V	320 V	385 V	440 V
Nominal Discharge Current (8/20 μs)	In			25kA
Maximum Discharge Current (8/20 μs)	Imax	100kA
Impulse Discharge Current (10/350 μs)	Iimp	25kA
Specific Energy	W/R	156 kJ / Ω
Charge	Q			12.5 As
Voltage Protection Level	Up	1 kV	1.5 kV	1.6 kV	1.8 kV	2 kV
Response Time	tA	< 25 ns
Back-Up Fuse (max)		315 A gL / gG
Short-Circuit Current Rating (AC)	ISCCR	50 kA
TOV Withstand 5s	UT	180V	335V	335V	335V	580V
TOV 120min	UT	230V	440V	440V	440V	765V
Number of Ports		1
Mechanical & Environmental
Operating Temperature Range	Ta	-40ºF to +158ºF [-40ºC to +70ºC]
Permissible Operating Humidity	RH	5%…95%
Atmospheric pressure and altitude		80k Pa … 106k Pa / -500 m…… 2000 m
Terminal Screw Torque	Mmax	39.9 Ibf·in[4.5 Nm]
Conductor Cross Section (max)		2 AWG (Solid, Stranded) / 4 AWG (Flexible) 35 mm² (Solid, Stranded) / 25 mm²(Flexible)
Mounting		35 mm DIN Rail, EN 60715
Degree of Protection		IP 20 (built-in)
Housing Material		Thermoplastic: Extinguishing Degree UL 94 V-0
Thermal Protection		Yes
Operating State / Fault Indication		Green ok / Red defect
Remote Contacts (RC) RC Switching Capacity RC Conductor Cross Section (max)		Optional AC: 250V / 0.5 A; DC: 250V / 0.1 A;125V / 0.2 A;75V / 0.5 A 16 AWG (Solid) / 1.5 mm²(Solid)

■ Internal Configuration

■ Dimensions & Packaging

■ Connection Diagram

FAQ for LY1-B25/1(S) MONOBLOCK Single-Pole SPD

1. What electrical systems is this SPD suitable for?
This single-pole SPD (LY1-B25/1(S)) supports L-PE or N-PE protection and is compatible with TN-S, TN-C, and TT low-voltage networks. It is installed mainly on the incoming side of main distribution boards in residential, commercial, and industrial applications. It meets Type 1 + Type 2 (Class I + II) surge protection requirements.

2. What is the surge discharge capability of this SPD?
The device provides a 25 kA (10/350 μs) impulse current (Iimp), 25 kA nominal discharge current (In, 8/20 μs), and a maximum discharge current (Imax) up to 100 kA. This ensures reliable protection even under strong lightning-induced surges.

3. Will the SPD affect the normal power supply during operation?
No. Under normal voltage conditions, the internal MOV components remain in a high-impedance state and do not interfere with the electrical system. The SPD activates only when a transient overvoltage occurs, safely diverting surge energy to ground.

4. Is the SPD compatible with all voltage levels?
The LY1-B25/1(S) supports operating voltages (Uc) from 150 V to 440 V AC (50/60 Hz), suitable for common single-phase 230 V and three-phase 400 V systems. Ensure your system voltage matches the rated voltage of the SPD before installation.

5. Does this SPD have a service life? How should it be maintained?
Yes. MOV-based SPDs naturally degrade after multiple surge events. This model features a status indicator (Green = OK / Red = Fault). If the indicator shows a fault, the SPD should be replaced immediately. For critical systems, periodic inspection every 1–2 years is recommended.

6. What standards and certifications does this SPD comply with?
The product is fully compliant with IEC 61643-11:2011 / EN 61643-11:2012 surge protection standards, ensuring safety and global engineering applicability.

7. Do you support OEM/ODM or private-label customization?
Yes. This model supports full OEM/ODM customization, including housing design, labeling, branding, packaging, and parameter configuration. Bulk and wholesale orders are available for distributors and project integrators.