Schneider Electric A9L16482 Acti9 iPRD1 12.5 Surge Arrester

A9L16482 iPRD1 12.5 surge arrester, three-phase plus neutral (3P + N)

The A9L16482 is Schneider Electric’s iPRD1 12.5 from the Acti9 line: a Type 1 + 2 combined surge arrester with a pluggable cartridge, built around an impulse-current rating (Iimp) of 12.5 kA in differential mode and 50 kA in common mode N/PE. It is a 3P + N device for 230/400 V AC (± 10 %) at 50/60 Hz networks, with a remote-signalling contact, and it is built for the TT, TN-S earthing arrangements named in its datasheet. Seven Star LLC supplies the A9L16482 in Oman and the GCC as an independent supplier based in Muscat.

This page reads the official datasheet of the A9L16482 and turns it into selection notes: what the ratings mean for a distribution board, which upstream protection the maker pairs with it, how it differs from the neighbouring models in the range, and what to send us when you ask for a quotation. It is a fixed-ratings component, so every number on this page is taken from the datasheet and nothing is inferred beyond it.

What the A9L16482 ratings mean in practice

The headline figure of this unit is its combined test class. A Type 1 + 2 arrester is rated with the impulse-current waveform used for lightning-current testing as well as the nominal and maximum discharge currents of Type 2 devices. The datasheet gives Iimp of Common mode: 50 kA N/PE; Differential mode: 12.5 kA L/N, a nominal discharge current of 20 kA and a maximum of 50 kA. Voltage protection level is stated as 1.5 kV type 1 + 2.

Because A9L16482 combines MOV and GDT technology, the neutral-to-earth path uses a spark-gap element, which is why its N/PE common-mode rating is the larger 50 kA while L/N is 12.5 kA. The rated continuous voltages are Differential mode: 350 V L/N; Common mode: 255 V N/PE, and the temporary-overvoltage behaviour is listed as 337 V L/N 5 s withstand; 1200 V N/PE 200 ms safe failure mode.

A9L16482 technical specifications

Poles, earthing and wiring of the A9L16482

The three line conductors and the neutral are all protected by the same unit, which is why it is two modules wide at nine-millimetre pitch. This is the arrangement for a standard three-phase four-wire board.

The earthing arrangement named on the datasheet is TT and TN-S. Terminals are Tunnel type terminal (phase) 10–25 mm² flexible; Tunnel type terminal (phase) 10–35 mm² rigid; Tunnel type terminal (earth) 16–25 mm² flexible; Tunnel type terminal (earth) 16–35 mm² rigid, tightened to 3.5 N.m. The wire-stripping length is 14 mm. Keep the earth conductor between the arrester and the main earth bar as short and straight as the board layout allows, because inductance in the lead adds directly to the let-through voltage.

Backup protection paired with the A9L16482

A surge arrester needs short-circuit protection in series so that a failed cartridge or element is isolated from the network. The datasheet of this unit names the associated devices below. The ampere figure shown is the rating of that breaker or fuse, and Icu is the breaking capacity quoted for it.

• Associated fuse gG 160 A 120 kA standard
• Associated circuit breaker Compact NSX160E 80 A 25 kA standard

A9L16482 against the other models in the range

The table compares this unit with related Acti9 surge arresters, using the figures printed in each datasheet. Pole count, remote contact and maximum discharge current are the three differences that drive most selections.

Installation and maintenance of the A9L16482

• Fit the arrester with its associated breaker or fuse on the same DIN rail (clip-on (din rail)), using the 8 module positions the unit occupies.
• Observe the operating window of -25–60 °C; a board in direct sun or with little ventilation can exceed it.
• Tighten to 3.5 N.m and re-torque after the first thermal cycles of commissioning.
• Wire the remote contact (1 SD (1 C/O), ) to a PLC input or a building-management point so that a failed cartridge raises an alarm instead of waiting for an inspection.
• The datasheet describes mechanical indicators: white while operating and red at end of life, on the device itself.

After a major lightning event or a supply fault, inspect surge protection even when no alarm has been raised. Keep a spare cartridge or a complete spare A9L16482 for plants where downtime is expensive; send us the part number and we will confirm what can be supplied.

Selection checklist for the A9L16482

• Confirm the system: 230/400 V AC (± 10 %) at 50/60 Hz, earthing TT and TN-S.
• Confirm pole count (3P + N) against the board: single-phase, three-phase with neutral, or four-pole.
• Decide whether a remote contact is needed (this version has one).
• Check the class: Type 1 + 2; match it to the position in the installation and to the lightning exposure.
• Check the voltage protection level (1.5 kV type 1 + 2) against the withstand level of the loads downstream.
• Choose the backup breaker or fuse from the list on this page and confirm it fits the board’s short-circuit level.

Where the A9L16482 is used in Oman and the GCC

The Type 1 + 2 rating suits boards at the service entrance of buildings that have an external lightning protection system or overhead supply lines, such as villas, small commercial premises, mosques, schools and clinics, which is also the market segment named on the datasheet (residential and small commercial). Lightning activity in the mountains, long overhead feeders to remote sites and hot, dusty switchrooms make surge protection and good board ventilation worth planning together. Check the ambient range on the datasheet against the real temperature inside the cabinet, not the room.

Documents and quotation

The official Schneider Electric datasheet of this unit is attached on this page for download, so the ratings above can be checked against the source.

To request a quotation, send us the part number A9L16482 with the quantity and delivery location through the RFQ form. Seven Star LLC replies with availability and lead time.