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Siemens 3RT2628-1AF05 — Contactors

Siemens 3RT2628-1AF05 SIRIUS Capacitor Contactor, S0, 45 mm

MPN3RT2628-1AF05
Active

Siemens SIRIUS 3RT2628-1AF05 capacitor contactor, S0 frame, 45 mm width, screw-type terminals, 50 Hz coil, screw and snap-on mounting on 35 mm DIN rail.

Siemens 3RT2628-1AF05 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2628-1AF05 — Identification
ParameterValue
Contactor frame sizeS0
3RT2628-1AF05 — Control & Coil
ParameterValue
Control supply voltage typeAC
Rated value @ 50 Hz0.8 ... 1.1
Rated value @ 50 Hz110 V
3RT2628-1AF05 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability0.00000001
3RT2628-1AF05 — Protection & Coordination
ParameterValue
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2628-1AF05 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionscrew-type terminals
Conductor cross-section, solid2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022
3RT2628-1AF05 — Durability
ParameterValue
Durability with aux. switch block (cycles, typ.)3 000 000
3RT2628-1AF05 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2628-1AF05 — Mechanical
ParameterValue
Width45 mm
Height150 mm
Depth155 mm
3RT2628-1AF05 — Specifications
ParameterValue
At AC4 ... 16 ms

Product details

Switching ratings and frequency limits

The 3RT2628-1AF05: Maximum switching frequency drops with voltage: 100 operations per hour at 230 V, 70/h at 480 V, and 36/h at 690 V — a key constraint when sizing for frequent capacitor bank cycling. The coil operates on 50 Hz AC at 110 V rated voltage, with screw-type terminals for the magnet coil connection.

For higher-current power circuits, a single 16 mm² conductor is allowed at 40 °C ambient, and a single 25 mm² at 60 °C — the larger cross-section compensates for the higher ambient temperature derating.

Frequently asked questions

What is the 3RT2628-1AF05 used for?

It is a capacitor contactor from the Siemens SIRIUS series, S0 frame, used for switching capacitive loads in power factor correction banks and similar applications where high inrush currents occur.

What are the key ratings of the 3RT2628-1AF05?

Maximum switching frequency is 100 operations per hour at 230 V, decreasing to 36/h at 690 V.

MPN
3RT2628-1AF05