ST120-3P
120kA per phase surge protection device for industrial and commercial applications with 3-phase protection.
Product Overview
Description
The ST120-3P provides comprehensive surge protection for 3-phase electrical systems.
With 120kA surge current capacity per phase, this SPD protects against severe lightning strikes and switching transients.
The compact DIN rail mounting allows easy installation in electrical panels.
Product Series
ST
Primary Application
Industrial control panels
Key Features
- 120kA high surge current capacity
- 3-phase protection with all modes
- Fast response <25 nanoseconds
- Visual status indication
- Remote monitoring contacts
- Compact DIN rail mounting
Specifications
| Voltage Rating | 480V AC (3-phase) |
|---|---|
| Surge Current | 120kA per phase |
| Protection Modes | L-L, L-N, L-G, N-G |
| Response Time | <25ns |
| Enclosure | DIN rail mount |
| Operating Temperature | -40°C to +85°C |
| Standards | UL 1449, IEC 61643-11 |
Applications
Industrial control panels
Industrial automation and control
Commercial electrical systems
Electronic system design
Motor control centers
Motor drive and control systems
Distribution panels
Electronic system design
Renewable energy systems
Renewable energy systems
Data center power
Electronic system design
FAE Expert Insights
"Surge protection is often overlooked but critical for equipment reliability. I've seen countless equipment failures from inadequate surge protection. The ST series provides excellent protection at a reasonable cost. For industrial applications, I always recommend at least 100kA rating at the service entrance. The visual indicator and remote contacts are valuable for maintenance - you can monitor protection status without panel access. Remember that SPDs degrade over time from repeated surges - plan for replacement every 5-10 years depending on exposure."
High-capacity surge protection with fast response for critical equipment
— Jennifer Chen, BeiLuo
Frequently Asked Questions
How often should surge protectors be replaced?
SPDs should be replaced when: 1) Visual indicator shows failure; 2) After major surge events; 3) Every 5-10 years depending on exposure. MOVs (metal oxide varistors) degrade over time from repeated surges even without complete failure. High exposure areas may need more frequent replacement. Monitor status indicators regularly.
Replace when indicator shows failure or every 5-10 years. Monitor status regularly.