T1-18 mm 25kA Surge Protective Device
18mm narrow-body T1 class surge protective device with 18mm per pole and maximum impulse current 25kA, suited to incoming cabinets with tight space.
Overview
Key Features
Narrow 18mm Body
18mm width per pole saves rail space inside cabinets
Direct Strike Protection
Iimp up to 25kA (10/350μs)
Nanosecond Response
≤50ns / ≤100ns discharge
Selectable Structures
Varistor, spark gap, graphite gap and combined types
Local Failure Indication
Failure window colour change is visible
Rail Mounting
Standard 35mm rail clip installation
Technical Data
| Operating voltage | AC 220V |
| Protection class | T1 |
| Single-pole width | 18mm |
| Maximum continuous operating voltage Uc | 275 / 320 / 385V AC |
| Maximum impulse current Iimp | Up to 25kA (10/350μs) |
| Voltage protection level Up | 1.5kV / 2.5kV |
| Response time | ≤50ns / ≤100ns |
| Mounting | Standard 35mm DIN rail |
| Operating temperature | -40℃ ~ +70℃ |
| Housing material | Thermoplastic flame-retardant PBT G20 V0 |
| Protection degree | IP20 |
| Protection modes | 1P / 2P / 3P / 4P / 1+NPE / 3+NPE |
Models & Selection
| Parameter | ZL1-V-12/275-4P | ZLS1-V-12/275-2P | ZL1-F-15/275-4P | ZL1-BC-25/320-3+NPE | ZL1-BC-25/385-3+NPE | ZL1-BC-15/275-1+NPE |
|---|---|---|---|---|---|---|
| Protection class | T1 | T1 | T1 | T1 | T1 | T1 |
| Maximum continuous operating voltage Uc | 275V | 275V | 320V | 385V | 385V | 275V |
| Maximum impulse current Iimp | 12.5kA | 15kA | 25kA | 25kA | 25kA | 15kA |
| Voltage protection level Up | 1.5kV | 2.5kV | 2.5kV | 2.5kV | 2.5kV | 2.5kV |
| Response time | ≤50ns | ≤100ns | ≤50ns | ≤50ns | ≤50ns | ≤100ns |
| Poles | 4P | 2P | 4P | 3+NPE | 3+NPE | 1+NPE |
| Dimensions (L×W×H mm) | 72×83×88 | 36×83×88 | 72×90×71 | 72×90×71 | 144×91×65 | 36×90×71 |
Model naming rule：ZL1-V-12/275-4P ZLS1-V-12/275-2P ZL1-F-15/275-4P ZL1-BC-25/320-3+NPE ZL1-BC-25/385-3+NPE ZL1-BC-15/275-1+NPE
Installation
FAQ
How does the 18mm body differ from the 36mm standard body?
The single-pole width is only 18mm, so more circuits fit on the same rail length. Electrical parameters remain T1 class with Iimp up to 25kA on the 10/350μs waveform.
How do the models map to the technical parameters?
Six models cover Iimp from 12.5kA to 25kA, Uc from 275V to 385V and Up from 1.5kV to 2.5kV. Structure and pole count vary by model.
Which installation scenarios is the device intended for?
It is intended for incoming cabinets or equipment room distribution boxes where space is limited but T1 class direct lightning strike protection is still required.
What are the installation requirements?
Mounting is on a standard 35mm rail inside a distribution cabinet. Operating temperature is -40℃ to +70℃ and the protection degree is IP20.
How is the product certified and quoted?
Certification is CE / CMA / CNAS accredited laboratory for the series. Price is Request a quote, with lead time agreed per project according to model and quantity.