OBO 5095314 V20-4+FS-550 Surge Arrester Type 2 4-Pole

5095314 is the OBO Bettermann SurgeController V20-4+FS-550: a four-pole type 2 (class II) surge arrester for 480 V nominal AC networks with a maximum continuous voltage of 550 V, a maximum discharge current of 40 kA (8/20 us) per pole and a potential-free changeover contact for remote signalling. It mounts on 35 mm DIN rail and is four division units wide.

Type 2 surge protection for main and sub-distribution boards

OBO describes the V20 as a type 2 surge arrester for equipotential bonding to VDE 0100-443 (IEC 60364-4-44), with high-performance varistors giving a discharge capacity up to 40 kA (8/20) per pole and 160 kA total. The modular arrester has a cut-off unit, a visual status display and a locking mechanism with vibration protection and voltage keying. Application given by OBO: equipotential bonding in main and sub-distributions.

The 550 V version suits 480 V nominal AC systems in TN-S and TN-C-S network forms; the datasheet lists the protection level as 2.4 kV or less (L-N), residual voltage 1.7 kV at 1 kA and 2.1 kV at 5 kA, response time below 25 ns, and a short-circuit resistance of 50 kA rms with a maximum back-up fuse of 160 A gL/gG. The housing is polyamide to UL 94 V-0.

Key features as printed in the datasheet

• Type 2 / class II to EN/IEC 61643-11; UL 1449 type 4 (datasheet entry).
• Umax continuous 550 V ac; nominal AC voltage 480 V; 4 poles.
• Maximum discharge current 40 kA (8/20) per pole; total 160 kA; nominal discharge 20 kA L-N (15 kA).
• Protection level up to 2.4 kV; response time below 25 ns.
• Visual function/defect display; changeover remote-signalling contact.
• Short-circuit resistance 50 kA rms with up to 160 A gL/gG back-up fuse.
• Operating temperature -40 to +80 C; humidity 5-95 %.

Technical specification

Electrical

Mechanical, signalling and environment

Selection and ordering guide

Use the 550 V four-pole version for TN-S or TN-C-S systems rated 480 V nominal. The OBO V20 family also includes 2-pole (5095312) and 3+1 versions at other voltages, and -FS indicates the remote-signalling variant.

Surge arresters are upstream protective devices; coordinate with a type 1 lightning-current arrester at the building entry where a structure has an external lightning protection system, and with type 3 devices at sensitive equipment. The back-up fuse must not exceed 160 A gL/gG.

Installation and operation notes

Install in the distribution board on 35 mm DIN rail with connection leads as short as possible (general surge protection practice); torque main terminals to 4 Nm and the signalling terminals to 0.2 Nm.

The arrester is for indoor installation, IP20, so it must sit inside an enclosure; use the visual display to check status and wire the changeover contact to a PLC or BMS for remote status monitoring.

Reading the type code: V20-4+FS-550 means V20 (family), 4 (four poles), +FS (with remote-signalling contact) and 550 (maximum continuous voltage in volts). The visual status display and the changeover contact allow a maintenance team to see a spent module from the front of the board and a control system to log the event, which shortens the time between a surge event and replacement.

Applications in Oman and the GCC

Industrial plants, offices, hospitals, data centres and utilities with 400/480 V distribution. Switching operations and grid faults, not only lightning, are common sources of surges that such arresters are installed to limit.

The wide temperature range (-40 to +80 C) and 5-95 % humidity rating cover most indoor switchroom conditions; check rooms without air-conditioning against the +80 C limit.

Installation and selection notes

Fit the V20-4+FS-550 on a 35 mm DIN rail in the main or sub-distribution board as close as practical to the incoming supply, keep the connecting conductors short, and coordinate the backup fuse with the value in the data sheet. The potential-free changeover contact can be wired to a building management or alarm system to signal a defective module. Replace modules when the status display shows a fault, and record the date in the maintenance log.

Information needed for a quotation

Send the code, the quantity, the delivery location in Oman or the GCC and any accessories such as connectors, covers, bends or fixings, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification before a purchase is confirmed. Ratings, dimensions and loads are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Compatible accessories and related items

Related OBO items: V10 surge arrester 5094931 (280 V, type 2+3), V20 2-pole 5095312, and V-TEC cable glands for the cabinet cable entry; see our category page for trays and glands.

Frequently asked questions

What network voltage is 5095314 for?

Nominal AC 480 V with a maximum continuous voltage of 550 V, TN-S and TN-C-S networks.

What is the discharge capacity?

40 kA (8/20) maximum per pole and 160 kA total.

Does it have remote signalling?

Yes, a potential-free changeover contact.

What back-up fuse is allowed?

Maximum 160 A gL/gG.

Is Seven Star LLC an OBO Bettermann distributor?

No. Seven Star LLC is an independent supplier in Muscat that sources OBO Bettermann products on request.

Documents and quotation

Download the official OBO Bettermann technical data sheet for 5095314 from this page. As an independent supplier based in Muscat, Seven Star LLC supplies OBO Bettermann items on request: use the quote form with the quantity you need. Check every value in the document against your own specification before you order. Browse similar items in the category.