Compact Type 2+3 AC Surge Protection for Two-Pole Circuits
LY1-D20/2(S) is a two-pole pluggable Type 2+3 AC surge protective device designed for sub-distribution boards and final equipment circuits. Its high-energy MOV modules provide dual-path surge suppression through L-PE and N-PE, with 10kA nominal discharge current and 20kA maximum discharge current.
Class II+III / Type 2+3 protection for downstream AC circuits
Two-pole design with L-PE and N-PE protection paths
10kA nominal and 20kA maximum discharge current
Replaceable cartridges with visual indication and optional remote contact
Suitable Applications
LY1-D20/2(S) is suitable for downstream and final-distribution AC circuits requiring compact two-pole Type 2+3 surge protection.
Sub-Distribution Boards
For downstream surge protection in residential, commercial, and light-industrial panels.
Residential Consumer Units
Suitable for household distribution systems requiring protection of line and neutral paths.
Small Machinery Panels
Helps protect control equipment, compact machines, and electronic loads from transient overvoltage.
Solar Inverter AC Boxes
For AC-side solar inverter boxes when the selected Uc version matches the system voltage.
FAQ
Common questions about LY1-D20/2(S) two-pole pluggable Type 2+3 AC surge protective device selection and installation.
What is LY1-D20/2(S) used for?
LY1-D20/2(S) is used for downstream surge protection in sub-distribution boards and final equipment circuits. It provides two protection paths for limiting transient overvoltage before it reaches connected loads.
Is LY1-D20/2(S) a single-pole or two-pole SPD?
LY1-D20/2(S) is a two-pole surge protective device. The existing page title describing it as single-pole should be changed to two-pole.
Is LY1-D20/2(S) a Type 2 or Type 3 SPD?
LY1-D20/2(S) is classified 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, based on the 8/20μs current waveform.
What voltage options are available?
Available maximum continuous operating voltage options are 75V, 150V, 275V, 320V, 385V, and 440V AC. Select the version according to the nominal system voltage.
What should be confirmed before ordering?
Confirm the nominal system voltage, required Uc and Up level, two-pole protection arrangement, 125A maximum backup-fuse coordination, conductor size, DIN-rail space, and remote-contact requirement.
