Phoenix Contact PLT-SEC-T3-120-FM-UT Type 2/3 Surge Protector

PLT-SEC-T3-120-FM-UT: Type 2/3 surge protector for 120 V supply lines

The Phoenix Contact PLT-SEC-T3-120-FM-UT (order no. 2907918) is a combined Type 2/3 surge protection device for 120 V single-phase lines, with screw terminals, status indicator and remote contact. Nominal voltage is 120 V AC (TN-S) with a maximum continuous operating voltage of 150 V AC and 150 V DC.

Seven Star LLC supplies the PLT-SEC-T3-120-FM-UT as an independent supplier in Muscat for projects in Oman and the GCC, quoted against the exact part number shown here.

Technical specifications of the PLT-SEC-T3-120-FM-UT

How the PLT-SEC-T3-120-FM-UT works

The PLT-SEC-T3-120-FM-UT belongs to the PLT-SEC series, in which a surge protective plug is inserted into a base element that holds the terminals and the remote-indication contact. When a voltage spike on the line exceeds the protection level, the protective components in the plug conduct and limit the voltage across the connected equipment; the datasheet gives the voltage protection level Up and the residual voltages for different discharge currents. Pulling the plug out removes the protection without disturbing the wiring, which is useful for replacement or insulation tests. A status indicator on the plug and a changeover contact in the base signal when the protection has been used up.

The nominal discharge current is 5 kA (8/20 us) and the maximum discharge current 10 kA, with a 6 kV combination wave and protection levels up to 0.75 kV L-N and 0.85 kV L-PE. These values are far higher than the 24 V plug, which is why it carries both Type 2 and Type 3 classification.

Where the PLT-SEC-T3-120-FM-UT fits in a system

Surge protectors of Type 3 (and the combined Type 2/3 variants) are installed near the equipment they protect, after the Type 1 and Type 2 stages at the building entrance and the distribution board. They limit the residual voltage that reaches electronics such as power supplies, PLC modules and communication devices. The series comes with different plugs for 24, 120 and 230 V, and with screw (UT) or push-in (PT) terminals, so the correct plug must be matched to the line voltage.

The PLT-SEC-T3-120-FM-UT can serve as the Type 2 stage in a 120 V sub-panel, as well as a Type 3 stage close to equipment.

Selection and ordering checklist

• Match the nominal voltage of the plug to the line: the PLT-SEC-T3-120-FM-UT is rated as shown in the table.
• Check the mains system (TN-S or TT) listed for the device.
• Confirm the load current is within the rated load current IL.
• Confirm the backup fuse size for through wiring against the limit in the table.
• Choose screw (UT) or push-in (PT) terminals to suit the wiring standard in your panel.
• Plan whether the remote-indication contact will be connected to a controller.

Installation, commissioning and maintenance of the PLT-SEC-T3-120-FM-UT

Clip the PLT-SEC-T3-120-FM-UT on a 35 mm DIN rail and connect line and neutral through the terminals (through wiring) or in branch wiring as the datasheet shows. Ground the PE terminal with a short, low-impedance conductor, because lead length adds to the let-through voltage during a surge. Keep the wiring from the protective device to the protected equipment short, and check the status indicator at each service visit.

Short-circuit rating is 10 kA AC. The base element and rated load current are 26 A at 30 degrees C.

Typical applications in Oman and the GCC

In Oman and the GCC, thunderstorms are less frequent than in many regions but switching transients, long overhead lines and generator sets all create surges. Protectors are common in telecom shelters, solar plants, oil and gas instrument cabinets and power-plant auxiliaries.

Single-phase 120 V circuits occur in some GCC installations with imported equipment, for example vendor skids and portable units.

Comparison with related PLT-SEC surge protection devices

Information to send with an RFQ

• Full part number PLT-SEC-T3-120-FM-UT and quantity.
• Line voltage, mains system and whether AC or DC.
• Load current and backup fuse size.
• Terminal type (screw or push-in).
• Whether remote indication is needed.
• Delivery location and date.

Documents and quotation

Send us the part number PLT-SEC-T3-120-FM-UT and the quantity you need, and we will confirm which official documents are available for this device. Seven Star LLC is an independent supplier in Muscat and quotes for projects across Oman and the GCC; we do not act on behalf of the manufacturer.

Please also tell us the delivery location and required timeline so that availability can be checked before you commit to a project schedule.