The ABB S ACE Tmax T3N 250 is a molded case circuit breaker (MCCB) designed to protect industrial electrical installations and distribution panels against overloads and short circuits.

Part of the renowned ABB SACE Tmax series, this circuit breaker offers high reliability, long service life and excellent performance even in demanding industrial applications. It is suitable for protecting electrical distribution lines, motors, transformers and low-voltage power distribution systems.

The T3N 250 model features a 250 A frame size with 3 poles, complies with IEC 60947-2, supports a rated operating voltage up to 690 V AC and provides an insulation voltage of 800 V.

The circuit breaker is equipped with an adjustable thermal-magnetic trip unit, allowing protection settings to be adapted to the requirements of the electrical installation.

⚙️ Technical Specifications

Brand: ABB
Series: SACE Tmax
Model: T3N 250
Type: Molded Case Circuit Breaker (MCCB)
Number of Poles: 3
Utilization Category: Cat. A
Standard: IEC 60947-2
Frequency: 50–60 Hz
Manufactured in: Italy

⚡ Electrical Specifications

Frame Rated Current (In): 250 A
Rated Operational Voltage (Ue): Up to 690 V AC
Rated Insulation Voltage (Ui): 800 V
Rated Impulse Withstand Voltage (Uimp): 8 kV

Breaking Capacity (Icu)

50 kA @ 230 V AC
36 kA @ 400/415 V AC
25 kA @ 440 V AC
20 kA @ 500 V AC
5 kA @ 690 V AC

Service Breaking Capacity (Ics)

75% of the Icu value at all rated voltages.

🔧 Trip Unit Settings

Thermal Protection (I1)

Adjustable to:

175 A (MIN)
212 A (MED)
250 A (MAX)

Magnetic Protection (I3)

Instantaneous Trip: 2500 A

Neutral Protection (I1N)

Adjustable to:

112 A
136 A
160 A

Neutral Magnetic Current (I3N)

1600 A

🔌 Compatible Accessories

Prepared for:

SOR (Shunt Opening Release)
UVR (Undervoltage Release)
AUX (Auxiliary Contacts)
MOS

🏭 Applications

✔ Low-voltage electrical distribution panels
✔ Industrial power distribution
✔ Electrical line protection
✔ Transformer protection
✔ Photovoltaic systems
✔ Industrial automation systems
✔ Industrial machinery
✔ Commercial and residential electrical installations

📦 Package Contents

1× ABB SACE Tmax T3N 250 Molded Case Circuit Breaker

📦 Condition

Used product
Good cosmetic condition
Operation not tested
Sold as shown in the photographs.

🚀 The ABB SACE Tmax T3N 250 is a professional 250 A molded case circuit breaker designed to provide reliable protection for electrical installations against overloads and short circuits. With its high breaking capacity, adjustable thermal-magnetic protection and ABB's proven build quality, it is an ideal solution for industrial plants, electrical panels and low-voltage distribution systems.

✅ Technical Summary

✅ Brand: ABB SACE
✅ Series: Tmax T3N 250
✅ Type: Molded Case Circuit Breaker (MCCB)
✅ Number of Poles: 3P
✅ Frame Rated Current: 250 A
✅ Adjustable Thermal Current (I1): 175–250 A
✅ Magnetic Protection (I3): 2500 A
✅ Rated Operational Voltage (Ue): Up to 690 V AC
✅ Rated Insulation Voltage (Ui): 800 V
✅ Rated Impulse Withstand Voltage (Uimp): 8 kV
✅ Breaking Capacity (Icu): Up to 50 kA @ 230 V AC
✅ Frequency: 50–60 Hz
✅ Standard: IEC 60947-2
✅ Manufactured in Italy