1P · MONOBLOCK
LY1-B25/1(S)
Clase I+II / Tipo 1+2
- RedTN-S, TN-C, TT*
- Uc150 / 275 / 320 / 385 / 440V
- Iimp25kA, 10/350μs
- In / Imax25kA / 100kA
- Arriba1.0–2.0kV, by Uc
- Max fuse315A gL / gG
LEEYEE · Built to Protect. Trusted to Last.
Type 1 Surge Protective Devices for Main Distribution Boards
High-energy AC SPDs for distributors, panel builders, contractors and OEM projects. Confirm Iimp, Uc, pole configuration, network system and model-specific documents before ordering.
- 25kA Iimp phase-path options
- 150V–440V AC Uc versions
- 1P to 3P+N arrangements
B25 MONOBLOCK RANGE
Type 1 lightning-current duty · IEC 61643-11 model documents confirmed individually
Main distribution protectionIncoming-side lightning-current duty
10/350μs Iimp selectionDo not replace Iimp with an Imax headline
Model-specific documentsVoltage, poles, branding and scope checked
Selección rápida
Start with the installation point and network
A Type 1 keyword is only the starting point. The final model depends on Uc, Iimp, protection mode, conductors and external backup protection.
Respuesta rápida
Use Type 1 duty at the service entrance or main distribution board where partial lightning current may enter the low-voltage installation. Then match the product to TT, TN-S or TN-C and the required pole arrangement.
| Sistema | Typical arrangement | Confirmación principal |
|---|---|---|
| Single-phase TN-S / TT | 1P+N or verified 2-pole solution | L-N / N-PE path, Uc, Iimp and backup protection |
| Three-phase TN-C | 3P | No separate neutral, selected Uc and Itotal |
| Three-phase TN-S | 4P o 3P+N | 4+0 versus 3+1 protection mode and document scope |
| Three-phase TT | Usually verified 3P+N solution | N-PE element, earthing design and follow-current data |
Send the single-line diagram or system details for final model confirmation.
Product Matrix
Choose the required pole arrangement
Compare the current B25 monoblock products by network, Uc and lightning-current rating. Choose a representative model first, then confirm the complete protection path and documentation.
2P · MONOBLOCK
LY1-B25/2(S)
Clase I+II / Tipo 1+2
- RedTN-S
- Uc150 / 275 / 320 / 385 / 440V
- Iimp / Itotal25kA / 50kA
- In / Imax25kA / 100kA
- Arriba1.0–2.0kV, by Uc
- Max fuse315A gL / gG
3P · TN-C
LY1-B25/3(S)
Clase I+II / Tipo 1+2
- RedTN-C
- Uc150 / 275 / 320 / 385 / 440V
- Iimp / Itotal25kA / 75kA
- In / Imax25kA / 100kA
- Arriba1.0–2.0kV, by Uc
- Max fuse315A gL / gG
4P · TN-S
LY1-B25/4(S)
Clase I+II / Tipo 1+2
- RedTN-S
- Uc150 / 275 / 320 / 385 / 440V
- Iimp / Itotal25kA / 100kA
- In / Imax25kA / 100kA
- Arriba1.0–2.0kV, by Uc
- Max fuse315A gL / gG
1P+N · TT / TN-S
LY1-B25/1(S)+1
Type 1+2 · MOV + GDT
- RedTT / TN-S
- ModoL-N / N-PE
- Uc150 / 275 / 320 / 385V
- Iimp / Itotal25/50kA · 50kA total
- Up L-N / N-PE1.0–1.8kV / 1.5kV
- Max fuse315A gL / gG
3P+N · TT / TN-S
LY1-B25/3(S)+1
Type 1+2 · MOV + GDT
- RedTT / TN-S
- ModoL-N / N-PE
- Uc150 / 275 / 320 / 385V
- Iimp / Itotal25/100kA · 100kA total
- Up L-N / N-PE1.0–1.8kV / 1.5kV
- Max fuse315A gL / gG
Why Type 1+2 products appear on a Type 1 landing pageThe buying requirement is Type 1 lightning-current duty at the main distribution level. The current B25 products meet that duty and are accurately classified Type 1+2 because they also state Type 2 In/Imax performance. System suitability, backup protection and document scope still require model confirmation.
Approval Checks
Three decisions prevent most specification mistakes
Keep the page focused on the engineering choices that directly affect product suitability and procurement risk.
Before approving the model
Do not select from the largest kA figure or pole count alone.
01
Confirm Iimp and the rated pathIimp uses 10/350μs. Check whether the value is per pole, per protection mode or the complete arrangement.
02
Match Uc and network topologyVerify system voltage, TT/TN-S/TN-C, 4+0 versus 3+1, and the N-PE element where applicable.
03
Confirm external backup protectionThe internal thermal disconnector does not automatically replace the required fuse or MCB.
Type 1 versus Type 1+2: the project may require Type 1 duty while the selected device is correctly classified Type 1+2. The B25 range states both Iimp and In/Imax rather than hiding the combined classification.
Incoming protection sequence
Review the Type 1 SPD as part of the complete distribution and earthing system.
Incoming supply and LPS conceptIdentify the network, lightning-current risk and protection zone.
External fuse or MCBConfirm the project short-circuit conditions and product data.
Type 1 duty at the MDBSelect Iimp, Uc, poles and protection mode.
Short PE path and downstream coordinationCoordinate bonding, conductor length and later Type 2 protection.
Testing & Documents
Use evidence that answers a purchasing risk
Component, impulse and thermal checks support product validation, but final approval still requires the exact model and document scope.
MOV & GDT validation
Component checks support the review of clamping behaviour, leakage-related parameters and batch consistency before assembly.
Lightning impulse testing
Confirm 10/350μs Iimp by pole or protection path and review Itotal separately where the arrangement requires it.
Thermal safety checks
Thermal behaviour and disconnection matter when MOVs age or face abnormal overvoltage conditions.
OEM and project supply without document mismatch
Confirm the base model first, then align the label, model name, packaging, instructions and applicable documentation before production.
Logo & labelModel namingArtwork approvalBatch consistency
PREGUNTAS FRECUENTES
Questions buyers ask before ordering
Where should a Type 1 SPD be installed?
Type 1 duty is generally considered at the service entrance or main distribution board where the protection concept expects partial lightning current to enter the low-voltage installation. The final location must follow the project lightning-protection, earthing and distribution design.
Why are the products labelled Type 1+2?
The current B25 products are combined Type 1+2 devices. They state Iimp for Type 1 duty and In/Imax for Type 2 duty. This page answers the Type 1 buying intent while preserving the products' full classification.
Should I choose 12.5kA or 25kA Iimp?
Choose from the project requirement, lightning protection level, current distribution assumptions and installation point. The B25 models shown here provide 25kA on the phase path. See the 12.5kA versus 25kA guide.
How do I choose 3P, 4P or 3P+N?
Start with the earthing system and protection mode. TN-C may use a three-pole arrangement, while TN-S or TT may require 4P or 3P+N depending on whether the design uses 4+0 or 3+1 protection. Pole count alone is not enough.
What information is needed for model confirmation?
Send the country, customer type, system voltage, TT/TN-S/TN-C network, required Iimp, pole arrangement, quantity, required documents, project timing and any single-line diagram or BOM available.
Confirm the system before approving the SPD
Send the basic project details directly from this page. LEEYEE can review Type 1 duty, Uc, poles, protection mode and model-specific document availability for distribution, panel-building, OEM and project orders.
- System voltage and TT / TN-S / TN-C network
- Required Iimp, poles and external backup protection
- Quantity, project timing and required certificate or report
CNSPD.com is LEEYEE's surge-protection platform for global buyers. LEEYEE is the product brand and supplier.
Direct inquiry
Request model confirmation
Send the essential project details now. We will use them to confirm the suitable model, document scope and quotation requirements.
LEEYEE · AC, DC/PV and signal surge protection for global B2B buyers · Built to Protect. Trusted to Last.