Item No.: LY1-B25/4(S)

LY1-B25/4(S) MONOBLOCK MULTI-POLE SPD

Description：

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

Our 100kA 4 pole AC surge protective device provides full protection for three-phase + neutral (4P) systems. It integrates graphite arc gap discharge chambers with MOV ZnO varistors, ensuring stable and high discharge capacity.
Encased in flame-retardant PVC/PA66/PBT housing, the device complies with IEC 61643-11:2011 / EN 61643-11:2022 and is approved with CE & TUV certifications.
We are a surge protection device factory and OEM/ODM manufacturer, supporting bulk orders, wholesale pricing, and in bulk supply.

Applicable scenarios / Application industries

Perfect for AC distribution panels, industrial equipment, residential surge boxes, and solar systems, this SPD features 35mm DIN rail mounting for fast installation and maintenance.

■ 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
Total Discharge Current (10/350μs)	Itotal	100kA
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-B25/4(S) MONOBLOCK MULTI-POLE SPD

1. What is the difference between the LY1-B254S and other monoblock SPDs?
The LY1-B254S is designed for higher surge capacity and enhanced multi-phase protection, making it suitable for heavier AC loads and larger distribution cabinets.

2. What type of surge protection elements are inside this model?
This SPD uses industrial-grade MOV (ZnO) varistors, chosen for high surge endurance and stable clamping characteristics.

3. Does this model meet global compliance requirements?
Yes, it is manufactured according to IEC 61643-11:2011 / EN 61643-11:2022, and is certified with CE + TUV, meeting European and global safety requirements.

4. Can this SPD be installed on 35 mm DIN rails?
Yes, the LY1-B254S supports standard DIN-rail mounting, making it easy to integrate into AC distribution systems.

5. In what applications is the LY1-B254S commonly used?
It is ideal for commercial buildings, industrial three-phase systems, power control cabinets, automatic equipment, and factory mains distribution.

6. Does the LY1-B254S support OEM services?
Yes. We are a factory specializing in OEM/ODM service, bulk production, and distributor partnerships.

7. What environmental protection features does this SPD offer?
The product features IP protection housing, flame-retardant casing, and high-temperature tolerance designed for demanding power environments.