Siemens 3RA2120-4DH27-0AP0 SIRIUS Motor Starter, 25 A AC-3

Name: 3RA2120-4DH27-0AP0
Brand: Siemens
SKU: 3RA2120-4DH27-0AP0
Availability: LimitedAvailability
Author: Reseller Rui

Specifications

Identification

3RA2120-4DH27-0AP0 — Identification
Parameter	Value
Product designation	Direct (on-line) starter
Main circuit poles	3
Brand	SIRIUS
Load feeder size	S0
Product design / construction	for 60 mm busbars
Circuit-breaker size	S0
Included contactor (type)	3RT2027-2AP00
Included circuit-breaker (type)	3RV2021-4DA20
Included link module (type)	3RA2921-2AA00

Ratings & Performance

3RA2120-4DH27-0AP0 — Ratings & Performance
Parameter	Value
Rated motor power at 400 V	11 000 kW
Rated voltage at AC-3, max.	690 V
Rated motor power at 460/480 V (hp)	20 hp
Rated current at 480 V	25 A
Rated current at 600 V	25 A
Rated operating frequency	50 ... 60 Hz
Rated impulse withstand voltage (Uimp)	6 kV
Rated insulation voltage Ui (AC, pollution degree 3)	690 V

Protection & Tripping

3RA2120-4DH27-0AP0 — Protection & Tripping
Parameter	Value
Trip class	CLASS 10
Short-circuit protection	Yes
Rated short-circuit current at 400 V (IEC 60947-4-1)	150 000 A
Overload release setting range (current)	18 ... 25 A
Overload release type	thermal (bimetallic)
Short-circuit trip type	magnetic
Duty / utilization type (IEC 60947-6-2)	2

Contacts & Control

3RA2120-4DH27-0AP0 — Contacts & Control
Parameter	Value
Rated value	690 V
Rated voltage range at 50 Hz	230 ... 230 V
Control supply voltage type	AC
Auxiliary switch extension	Yes
Switching contact type	electromechanical

Communication

3RA2120-4DH27-0AP0 — Communication
Parameter	Value
AS-Interface protocol support	No

Mechanical & Connection

3RA2120-4DH27-0AP0 — Mechanical & Connection
Parameter	Value
Mounting / fastening method	for snapping onto 60 mm busbar systems
Mounting position	vertical
Width	45 mm
Height	260 mm
Depth	165 mm

Environmental

3RA2120-4DH27-0AP0 — Environmental
Parameter	Value
Operating temperature range	-20 ... +60 °C
Storage temperature range	-50 ... +80 °C
Transport temperature range	-50 ... +80 °C
Shock resistance (IEC 60068-2-27)	6g / 11 ms

Product details

SIRIUS S0 direct-on-line starter — 25 A AC-3, Class 10

The Siemens 3RA2120-4DH27-0AP0 is a SIRIUS direct-on-line starter in the S0 load feeder size, designed for snapping onto 60 mm busbar systems.

Supplied contactor and link module — drop-in ready

This starter ships with a 3RT2027-2AP00 contactor and a 3RA2921-2AA00 link module, so the main current path and control wiring are pre-configured for the S0 frame.

Panel fit — 45 mm wide, 260 mm tall, 165 mm deep

At 45 mm wide, 260 mm tall, and 165 mm deep, the S0 footprint fits standard 60 mm busbar centers with the vertical mounting position specified. Clearance requirements: 50 mm upwards, 20 mm forwards, 20 mm at the side, 10 mm downwards, and 0 mm backwards — useful when packing multiple starters in a row.

Frequently asked questions

What is the 3RA2120-4DH27-0AP0 rated for in AC-3 duty?

The trip class is Class 10, so it handles normal motor start transients without nuisance tripping.

Does the 3RA2120-4DH27-0AP0 come with the contactor and link module?

Yes — it ships with a 3RT2027-2AP00 contactor and a 3RA2921-2AA00 link module, pre-configured for the S0 frame.