Compact Type 2+3 AC Surge Protection for Final Distribution Circuits
LY1-D20/1(S) is a single-pole pluggable Type 2+3 AC surge protective device designed for sub-distribution boards and downstream equipment circuits. Its high-energy MOV module provides fast transient-voltage limitation with 10kA nominal discharge current and 20kA maximum discharge current, making it suitable for compact final-distribution protection.
Class II+III / Type 2+3 protection for downstream AC circuits
10kA nominal and 20kA maximum discharge current
75V to 440V AC versions for different low-voltage systems
Replaceable cartridge with visual indication and optional remote contact
Suitable Applications
LY1-D20/1(S) is suitable for downstream and final-distribution AC circuits requiring compact Type 2+3 surge protection close to sensitive electrical equipment.
Sub-Distribution Boards
For downstream surge protection in residential, commercial, and light-industrial distribution panels.
Residential Panels
Suitable for household consumer units and residential electrical distribution systems.
Equipment Supply Circuits
Helps protect control equipment, electronic loads, and machinery supply circuits from transient overvoltage.
Solar Inverter AC Boxes
For AC-side solar inverter boxes when the selected Uc version matches the installation voltage.
FAQ
Common questions about LY1-D20/1(S) single-pole pluggable Type 2+3 AC surge protective device selection and installation.
What is LY1-D20/1(S) used for?
LY1-D20/1(S) is used for downstream surge protection in sub-distribution boards and final equipment circuits. It helps limit transient overvoltage before it reaches sensitive electrical and electronic loads.
Is LY1-D20/1(S) a Type 2 or Type 3 SPD?
The product page classifies LY1-D20/1(S) as Class II+III / Type 2+3, making it suitable for coordinated downstream and final-distribution surge protection.
What discharge current ratings does it provide?
It provides 10kA nominal discharge current In and 20kA maximum discharge current Imax, both based on an 8/20μs current waveform.
What voltage options are available?
Available maximum continuous operating voltage options are 75V, 150V, 275V, 320V, 385V, and 440V AC. The correct version must be selected according to the nominal system voltage.
What is the benefit of the pluggable design?
The replaceable cartridge allows the protection module to be inspected or replaced without removing the permanently wired base, simplifying maintenance.
What should be confirmed before ordering?
Confirm the nominal system voltage, required Uc and Up level, single-pole protection arrangement, 125A maximum backup-fuse coordination, conductor size, DIN-rail space, and remote-contact requirement.
