Item No.: LY1-B25/3(S)

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

Description：

Class l·Class ll·Type 1·Type 2
Location of Use: Main Distribution Boards
Network Systems: TN-C
Mode of Protection: L-PE / L’-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

The 100kA 3 pole surge protective device delivers heavy-duty protection for three-phase power systems in industrial and commercial facilities.
Built with graphite arc gap + MOV ZnO technology, it provides extremely fast response time and high discharge capacity against surge currents.
Its housing uses durable PVC/PA66/PBT materials, compliant with IEC 61643-11:2011 / EN 61643-11:2022, and certified by CE and TUV.
We are a professional surge protective device manufacturer and supplier, offering OEM, ODM, wholesale, factory direct, and bulk buy support.

Applicable scenarios / Application industries

Installation is simple via 35mm DIN rail, suitable for solar combiner boxes, power control systems, and AC distribution panels.

■ 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	75kA
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-B25/3(S) MONOBLOCK MULTI-POLE SPD

1. What makes the LY1-B253S suitable for multi-phase AC systems?
The LY1-B253S is a monoblock multi-pole (2P/3P/4P) SPD, allowing coordinated protection across multiple phases in three-phase or split-phase AC networks.

2. What protection technology does this model use?
It uses MOV-based surge absorption, optimized for repeated AC transients and high-energy impulse handling.

3. What certifications does this SPD carry?
It is built following IEC 61643-11:2011 / EN 61643-11:2022, and is CE and TUV certified, suitable for international engineering projects.

4. Is the LY1-B253S appropriate for industrial use?
Yes. Its multi-pole configuration makes it suitable for industrial control panels, machinery power inputs, commercial buildings, and main distribution boards.

5. What housing materials are used?
The enclosure is molded from PA66/PBT high-temperature flame-retardant material, ensuring structural stability during surge events.

6. Can this SPD be purchased in bulk?
Yes, wholesale, factory-direct bulk purchase, OEM/ODM branding, and distributor packages are all supported.

7. Is this model equipped with a visual fault indicator?
Yes, the SPD features a clear status indicator window to show operating condition and failure status.