Siemens 3VA1225-5FF42-0KC0 SENTRON MCCB, 125 A, 4-Pole, 187

Name: 3VA1225-5FF42-0KC0
Brand: Siemens
SKU: 3VA1225-5FF42-0KC0
Availability: LimitedAvailability
Author: Compliance Quentin

Specifications

Identification

3VA1225-5FF42-0KC0 — Identification
Parameter	Value
Product designation	Molded case circuit breaker
Brand / range	SENTRON
Basic switch (supplied) ref.	3VA12255FF420AA0
Integrated auxiliary / alarm switch ref.	3VA9988-0AA12

Ratings

3VA1225-5FF42-0KC0 — Ratings
Parameter	Value
Number of poles	4
Rated operational voltage Ue (AC)	690 V
Rated insulation voltage Ui	800 V
Current at 40 °C	250 A
Current at 45 °C	250 A
Current at 50 °C	250 A
Current at 55 °C	243 A
Current at 60 °C	237 A
Current at 65 °C	230 A
Current at 70 °C	223 A
Switching capacity class	M
Breaking capacity at 240 V	187 kA
Breaking capacity at 415 V	121 kA
Breaking capacity at 440 V	75.6 kA
Breaking capacity at 500 V	30 kA
Breaking capacity at 690 V	17 kA
Power loss, max.	57 W

Protection & Trip Unit

3VA1225-5FF42-0KC0 — Protection & Trip Unit
Parameter	Value
Overcurrent release (trip unit) type	TM240
Overcurrent protection function	LI
Ground-fault monitoring	Without
Grounding protection function	No

Construction & Connection

3VA1225-5FF42-0KC0 — Construction & Connection
Parameter	Value
Main circuit connection type	nut keeper kit on both ends
Main circuit connector arrangement	Front terminal
Protection class (IP), front	IP40

Accessories & Functions

3VA1225-5FF42-0KC0 — Accessories & Functions
Parameter	Value
Undervoltage release	No
Voltage trigger	Yes
Trip indicator	No
Communication function	No
Measurement function	No
Motor drive option	Yes
Auxiliary CO contacts	2

Environmental

3VA1225-5FF42-0KC0 — Environmental
Parameter	Value
Operating temperature, max.	70 °C
Operating temperature, min.	-25 °C
Storage temperature, max.	80 °C
Storage temperature, min.	-40 °C

Mechanical

3VA1225-5FF42-0KC0 — Mechanical
Parameter	Value
Mechanical service life (operating cycles), typ.	20 000
Height	158 mm
Width	140 mm
Depth	70 mm
Height (in)	6.22 in
Width (in)	5.51 in
Depth (in)	2.76 in

Product details

MCCB for line protection — 125 A, 4-pole, high breaking capacity

The Siemens SENTRON 3VA1225-5FF42-0KC0 is a 4-pole molded case circuit breaker rated at 125 A continuous, designed for line protection in distribution panels. Its breaking capacity reaches 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V — figures that cover most industrial fault-current scenarios without needing an upstream current-limiting fuse. Rated insulation voltage is 800 V, and the breaker carries a shunt trip (STL) release plus two HQ auxiliary switches — enough for remote tripping and status feedback in a motor control center or switchboard.

Thermal derating and panel integration

The breaker holds 250 A continuously at ambient temperatures up to 50 °C, then derates linearly to 223 A at 70 °C — critical when the breaker shares an enclosure with other heat sources. Operating range is -25 °C to +70 °C; storage range is -40 °C to +80 °C. Dimensions are 70 mm deep, 140 mm wide, 158 mm high — a standard 4-pole MCCB footprint for DIN-rail or screw-mount panel integration. Maximum power loss at rated current is 57 W, which should be factored into enclosure thermal calculations.

Frequently asked questions

How do I get current pricing and availability for 3VA1225-5FF42-0KC0?

Submit an RFQ against this order code. Availability and current pricing are confirmed at quote time through independent distribution.

What are the key ratings of 3VA1225-5FF42-0KC0?

Rated 125 A continuous, 4-pole, breaking capacity 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. Rated insulation voltage 800 V. Includes shunt trip and two auxiliary switches.

What compliance documentation does Siemens provide for 3VA1225-5FF42-0KC0?

Siemens provides RoHS, REACH, and IEC/UL certification documentation for the SENTRON 3VA series. Full declarations of conformity are available on request.