LY1-B25/3(S)+1 MONOBLOCK MULTI-POLE SPD

Description：

Class 1·Class II·Type 1·Type 2
Location of Use: Main Distribution Boards
Network Systems:TT, TN-S
Mode of Protection: L-N/ L’-N,N-PE
Surge Ratings: limp = 25 kA/ 100 kA(10/350 μs)
In = 25 kA/ 100 kA(8/20 μs)
IEC/EN Category: Class 1+11 / Type 1+2
Protective Elements: High Energy MOV and GDT
Housing: Monoblock Design
Compliance:IEC 61643-11:2011
EN 61643-11:2012

The 100kA 3P+N GDT AC surge protective device is a high-performance product designed for three-phase + neutral AC systems.
It adopts graphite arc gap discharge, MOV ZnO, and GDT protection, ensuring fast response and high reliability during lightning strikes or transient voltage surges.
Built from PVC/PA66/PBT flame-retardant housing, certified by CE and TUV, and manufactured under IEC 61643-11:2011 / EN 61643-11:2022 standards.
As a factory OEM/ODM manufacturer, we offer bulk buy, in bulk, and wholesale services for global customers.

Applicable scenarios / Application industries

Compatible with 35mm DIN rail, it’s widely used in solar power systems, AC distribution boards, industrial control boxes, and building lightning protection networks.

■ Technical Data
IEC Electrical			150	275	320	385
Nominal AC Voltage (50/60Hz)		Uo/ Un	120 V	230 V	230 V	230 V
Maximum Continuous Operating Voltage (AC)	(L-N)	Uc	150 V	275 V	320 V	380V
Maximum Continuous Operating Voltage (AC)	(N-PE)	Uc	255 V	255 V	255 V	255 V
Nominal Discharge Current (8/20 μs)	(L-N) / (N-PE)	In	25 kA /100 kA
Maximum Discharge Current (8/20 μs)	(L-N) / (N-PE)	Imax	100 kA
Impulse Discharge Current (10/350 μs)	(L-N) / (N-PE)	Iimp	25 kA / 100 kA
Total Discharge Current (10/350 μs)		Itotal	100 kA
Specific Energy	(L-N) / (N-PE)	W/R	156 kJ / Ω / 2.5 M kJ / Ω
Charge	(L-N) / (N-PE)	Q	12.5 As / 50 As
Voltage Protection Level	(L-N) / (N-PE)	Up	1 kV / 1.5 kV	1.5 kV / 1.5 kV	1.6 kV / 1.5 kV	1.8 kV / 1.5 kV
	(N-PE)	Ifi	100 ARMS
Response Time	(L-N) / (N-PE)	tA	< 25 ns / < 100 ns
Back-Up Fuse (max)			315 A gL / gG
Short-Circuit Current Rating (AC)	(L-N)	ISCCR	50 kA
TOV Withstand 5s	(L-N)	UT	180 V	335 V	335 V	335 V
TOV 120min	(L-N)	UT	230 V	440 V	440 V	440 V
TOV Withstand 200ms	(N-PE)	UT	1200 V
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
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-B25/3(S)+1 MONOBLOCK MULTI-POLE SPD

1. What applications is the LY1-B25 3S+1 suitable for?
This multi-pole SPD is designed for three-phase AC systems, industrial machinery power inputs, pump control panels, and large distribution boards.

2. What surge-handling components does it use?
It uses high-quality MOV (ZnO) varistors that provide stable and consistent protection against repeated surges.

3. Is this model certified for global use?
Yes, it complies with IEC 61643-11:2011 / EN 61643-11:2022 and carries CE and TUV certifications for international projects.

4. What makes the monoblock structure advantageous?
The one-piece monoblock design increases thermal stability, prevents loose electrical contacts, and enhances long-term durability.

5. Does the LY1-B25 3S+1 support large wholesale orders?
Yes, we are a professional factory offering bulk orders, OEM/ODM production, distributor service, and long-term supply.

6. Can it be installed using a standard DIN rail?
Yes, the SPD mounts directly onto 35 mm DIN rails used in AC panels.

7. Does this SPD include an operation status indicator?
Yes, it features a front-panel visual indicator to show protection and failure status.