3RT1034-3AG20

What does this power contactor do in a control panel?

It is an electromechanical switching device designed to repeatedly switch power to loads such as three-phase motors or resistive loads. The coil is energised by a control voltage, which closes the main power contacts to feed the load.

What loads and duties is it designed for?

It is rated for common IEC utilisation categories including AC-3 (motor duty) and AC-1 (resistive/low-inductive duty). Typical ratings include AC-3: 32 A at 400 V and 15 kW at 400 V, and AC-1: 50 A at 400 V (also 50 A up to 690 V at 40 °C).

What is the control coil voltage and frequency?

The control coil is 110 V AC and is suitable for both 50 Hz and 60 Hz operation.

Can it be driven by a DC control voltage?

No. This variant is specified with an AC coil (110 V AC, 50/60 Hz). If your control circuit is DC, you would need a version with a DC coil.

How many main poles does it have?

It is a 3-pole contactor, providing three normally-open main contacts for three-phase switching.

Are auxiliary contacts included as standard?

No auxiliary contacts are integrated as standard (0 NO and 0 NC instantaneous auxiliary contacts). If auxiliary signalling is required, an add-on auxiliary contact block is typically used.

What is the rated insulation voltage and impulse withstand capability?

The rated insulation voltage is 690 V, and the rated surge voltage resistance is 6 kV.

What are the typical current ratings for motor switching?

For IEC AC-3 motor duty, typical operating current is 32 A at 400 V and 20 A at 690 V. For more severe AC-4 duty at 400 V, the rating is 29 A.

What mounting options are supported?

It supports screw mounting and snap-on mounting onto a 35 mm standard mounting rail (DIN EN 50022). Side-by-side mounting is permitted.

What are the approximate dimensions?

Approximate dimensions are 112 mm (H) × 55 mm (W) × 115 mm (D).

What is the IP protection rating?

The front is rated IP20. The terminals are rated IP00.

What are the permissible ambient conditions?

Typical operating ambient temperature range is -25 to +60 °C, and storage temperature range is -55 to +80 °C. Maximum installation altitude is 2,000 m above sea level.

What type of terminals does it use?

The main power circuit uses screw-type terminals. The auxiliary/control circuit uses spring-loaded terminals.

What conductor sizes can be connected to the main terminals?

Typical connectable conductor cross-sections for main contacts include solid: 2× (0.75 to 16 mm²) and stranded: 2× (0.75 to 25 mm²). AWG range is typically 2× (18 to 2).

What conductor sizes can be connected to the control/auxiliary terminals?

Typical connectable conductor cross-sections for auxiliary/control terminals include solid: 2× (0.25 to 2.5 mm²) and finely stranded with core end processing: 2× (0.25 to 1.5 mm²). AWG range is typically 2× (24 to 14).

How fast does the contactor switch?

Typical closing delay is 11 to 30 ms, opening delay is 7 to 20 ms, and arcing time is 10 to 15 ms (AC coil operation).

What are the coil power characteristics?

Typical apparent pick-up power is 127 VA and apparent holding power is 11.3 VA for the AC coil.

What switching frequency can be expected in normal use?

Typical maximum operating frequencies include AC-1 up to 1,200 operations/hour, AC-3 up to 1,000 operations/hour, and AC-4 up to 250 operations/hour. No-load switching frequency is typically up to 5,000 operations/hour (AC).

What short-circuit protection guidance is provided for the main circuit?

Typical guidance for short-circuit protection of the main circuit specifies gL/gG fuses of 125 A for coordination type 1 and 63 A for coordination type 2.

What is the typical mechanical endurance?

Typical mechanical service life is 10,000,000 switching cycles for the contactor. With an added electronics-compatible auxiliary switch block, typical life is 5,000,000 cycles.

Is this suitable for controlling a 15 kW motor at 400 V?

Yes, for IEC AC-3 duty it is typically rated 15 kW at 400 V (with an AC-3 operating current of 32 A at 400 V). For reference, this is the Siemens SIRIUS power contactor 3RT1034-3AG20 variant with a 110 V AC coil.