Surge protective device Type 1+2+3 (B+C+D) | 1P | Iimp 12.5 kA | In 30 kA | Imax 50 kA | Uc 280 V | Up < 1.3 kV | PO I 1

Surge protective device Type 1+2+3 (B+C+D) | 1P | Iimp 12.5 kA | In 30 kA | Imax 50 kA | Uc 280 V | Up < 1.3 kV | PO I 1

PO I 1 is a single-pole Type 1+2+3 (B+C+D) surge protective device: incomer and fine protection stages in one 2.5-module housing. Iimp 12.5 kA (10/350 µs), In 30 kA, Imax 50 kA, Up < 1.3 kV, Uc 280 V.

• Iimp 12.5 kA (10/350 µs) – for partial lightning current at the supply entry.
• In 30 kA, Imax 50 kA – for strong switching impulses.
• Up < 1.3 kV – T3-level protection for nearby equipment.
• Plug-in module and status window.
• 2.5 modules wide – saves space in the switchboard.

• GA&DA G30-B+C/280/12.5-1P – 1P | Iimp 12.5 kA | Up ≤ 1.5 kV – T1+T2 without a T3 stage – when sensitive equipment is further from the supply entry.
• LSP FLP7-275/1S – 1P | Iimp 7 kA | Up ≤ 1.5 kV – T1+T2 without a T3 stage – when sensitive equipment is further from the supply entry.
• LSP FLP12.5-275/4S – 4P TN-S | Iimp 12.5 kA | Up ≤ 1.5 kV – T1+T2 without a T3 stage – when sensitive equipment is further from the supply entry.

• Small incoming switchboard with sensitive equipment in the same switchboard or nearby
• Communication, security and automation switchboards
• Private house supply entry with an overhead line
• Buildings with a lightning protection system (LPL III–IV)
• AC side of a solar PV plant
• Heat substations and pumping stations

• Install only with the supply disconnected; verify the absence of voltage on all poles.
• Connect the SPD upstream of the residual current device (RCD) or downstream of an S-type RCD.
• PE conductor to the main earthing terminal – not smaller than 16 mm² Cu, as short as possible and without loops.
• Backup fuse rating – according to the manufacturer's limit; if the incoming fuse is larger, provide a separate fuse for the SPD.
• Before insulation resistance testing, pull out the modules or disconnect the SPD.
• Work must be carried out by a qualified electrician; check the indicators after a storm.

• Keep the leads to the SPD and from it to PE as short as possible – total length up to 0.5 m. Every extra metre adds about 1 kV to Up and the protection loses its point.
• Run the PE conductor straight to the main earthing bar, not through other devices' terminals. In a Type 1 circuit use at least 16 mm² Cu.
• Pull out the modules or disconnect the SPD before an insulation resistance test (500–1000 V) – otherwise the tester shows "leakage" and the modules may be damaged.
• Check the indicator after every storm and at least once a year. Keep a spare module on site – replacement takes a minute: isolate only the SPD backup fuse or MCB, the rest of the board can stay in service.
• If the sub-boards are more than 10 m away or feed sensitive electronics, add a separate Type 2 or Type 3 SPD there – the incomer alone is not enough.

Quick selection guide

Suitable when you need:

• To protect the supply entry and nearby sensitive equipment with one device
• Little space in the switchboard
• Supply entry of a building with a lightning protection system or an overhead line

Check before use:

• The earthing system and the required number of poles
• The distance to sensitive equipment
• The backup fuse rating

Important reminder: T3-level protection only works close to the SPD – remote switchboards need a separate stage.

Technical data provided by the supplier (the manufacturer's datasheet is not publicly available).

Checked 2026-10-17.

Surge protective device Type 1+2+3 (B+C+D) | 1P | Iimp 12.5 kA | In 30 kA | Imax 50 kA | Uc 280 V | Up < 1.3 kV | PO I 1

PO I 1 – T1+T2+T3 (B+C+D) single-pole surge protective device: Iimp 12.5 kA, Imax 50 kA, Up < 1.3 kV. Compact three-stage protection in one 2.5-module housing.