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

Description：

Class 1·Class Il·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/ 50 kA (10/350 μs)
l„ = 25 kA/ 50 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

This 100kA 1P+N GDT AC surge protective device combines graphite arc gap, MOV ZnO, and GDT (Gas Discharge Tube) technology for ultra-reliable surge protection.
It offers excellent coordination between discharge and clamping performance, ideal for AC power systems and residential lightning protection.
The housing, made of high-strength PVC/PA66/PBT, ensures insulation and safety. Complies fully with IEC 61643-11:2011 / EN 61643-11:2022, and carries CE and TUV marks.
We are a professional manufacturer, supplier, and factory providing OEM/ODM customization, wholesale, and bulk buy options.

Applicable scenarios / Application industries

Installed on 35mm DIN rail, it fits perfectly into combiner boxes, control cabinets, and power panels.

■ 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 / 50 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 / 50 kA
Total Discharge Current (10/350 μs)		Itotal	50 kA
Specific Energy	(L-N) / (N-PE)	W/R	156 kJ / Ω / 625 kJ / Ω
Charge	(L-N) / (N-PE)	Q	12.5 As / 25 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, 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)+1 MONOBLOCK SINGLE-POLE SPD

1. What distinguishes the LY1-B25 1S+1 from other single-pole monoblock SPDs?
The LY1-B251S1 features an optimized MOV surge module with fast clamping speed, making it suitable for environments where frequent transient overvoltage occurs on AC power lines.

2. Does this SPD meet IEC and EN standards?
Yes, it is fully manufactured according to IEC 61643-11:2011 and EN 61643-11:2022, and carries CE and TUV certifications.

3. Is the LY1-B25 1S+1 mainly for AC protection?
Correct. This monoblock SPD is designed specifically for AC low-voltage distribution circuits, service panels, and equipment supply lines.

4. What material is the enclosure made of?
It uses PA66/PBT flame-retardant housing, ensuring safety and durability under high-temperature surge events.

5. Does this SPD support OEM/ODM customization?
Yes, we provide OEM/ODM, private logo printing, customized voltage options, and wholesale factory supply.

6. Can the LY1-B25 1S+1 be installed on a DIN rail?
Yes, it is compatible with 35 mm DIN-rail mounting for quick installation.

7. What warranty is provided?
The product includes a 2-year warranty and long-term technical support.