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ABB SACE Isomax S series molded case circuit breakers, covering the full current range from 125A to 3200A

ABB SACE Isomax S series molded case circuit breakers, covering the full current range from 125A to 3200A

The ABB SACE Isomax S series comprises eight frame sizes (S1 through S8) with current ratings ranging from 125A to 3200A and ultimate breaking capacities up to 200kA. It supports fixed, plug-in, and withdrawable versions, as well as 1000V AC/DC applications, and offers an optional PR212/P electronic trip unit for overload, short-circuit, and earth-fault protection.
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Product Details

Core Parameter Overview
The SACE Isomax S series comprises eight frame sizes (S1 to S8), covering a current range from 125A to 3200A. Below is an overview of its core features:
Frame Model Rated current Iu (A) Ultimate breaking capacity Icu (415V AC) Overcurrent trip unit type Extreme number
S1 125 16 - 25 kA Thermomagnetic 3, 4
S2 160 16 - 50 kA Thermomagnetic 3, 4
S3 160 - 250 35 - 85 kA Thermomagnetic/Electronic 3, 4
S4 250 50 - 100 kA Electronic type (PR211/P, PR212/P) 3, 4
S5 400 - 800 50 - 100 kA Thermomagnetic/Electronic 3, 4
S6 800 65 - 120 kA Thermomagnetic/Electronic 3, 4
S7 1200 - 1600 100 - 200 kA Electronic (PR212/P) 3, 4
S8 2000 - 3200 100 - 200 kA Electronic (PR212/P) 3
Note: Breaking capacity ratings are usually classified as N (standard type), H (high breaking capacity type), L (current limiting type), etc., and the specific values ​​vary depending on the model and voltage.

Detailed technical specifications
The following are detailed parameters compiled from ABB's official technical manual:
1. Thermal-magnetic circuit breakers (S1 - S3/S5/S6)
Suitable for AC or DC systems, it mainly relies on bimetallic strips and electromagnetic coils to achieve overload and short circuit protection.
Parameter Items S1 S2 S3 S5
Rated current In (A) 125 160 160 / 250 400 / 800
Extreme number 3, 4 3, 4 3, 4 3, 4
Rated insulation voltage Ui (V) 500 690 800 1000
Rated impulse withstand voltage Uimp (kV) 6 6 8 8
Ultimate breaking capacity Icu (380/415V AC) 25 kA 50 kA 65 kA (H type) 100 kA (H type)
Ultimate breaking capacity Icu (500V DC) —— —— 50 kA 50 kA (3 poles in series)
Trip unit type TMF (Thermomagnetic) TMF (Thermomagnetic) TMF / TMA (Thermomagnetic) TMA (Thermomagnetic)
Mechanical life (times) 25,000 25,000 25,000 20,000
Electrical life (cycles) (415V) 8,000 8,000 8,000 - 10,000 8,000
External dimensions (W x H x D) (3P, mm) 78 x 120 x 70 90 x 120 x 70 105 x 170 x 103.5 140 x 254 x 103.5
Weight (kg, 3P) 0.9 1.1 2.6 5.5

 

2. Electronic circuit breakers (S4 - S8)
Suitable for demanding power distribution systems, equipped with a microprocessor trip unit, providing more precise overload and ground fault protection.
Parameter Items S4 S5 S6 S7 S8
Rated current In (A) 250 400 - 800 630 - 800 1200 - 1600 2000 - 3200
Extreme number 3, 4 3, 4 3, 4 3, 4 3
Rated insulation voltage Ui (V) 800 1000 1000 1000 1000
Rated impulse withstand voltage Uimp (kV) 8 8 8 12 12
Ultimate breaking capacity Icu (380/415V AC) 100 kA (L type) 100 kA (L type) 120 kA (L type) 200 kA (V) 200 kA (V)
Trip unit model PR211/P, PR212/P PR212/P PR212/P PR212/P PR212/P
Protection function LI / LSI / LSIG LSI / LSIG LSI / LSIG LSI / LSIG LSI / LSIG
Mechanical life (times) 20,000 20,000 20,000 10,000 10,000
External dimensions (W x H x D) (3P, mm) 105 x 254 x 103.5 140 x 254 x 103.5 210 x 268 x 103.5 210 x 406 x 111 406 x 440 x 235
Weight (kg, 3P) 4.0  5.5 - 11.0 9.5 37.5 135

 

Trip Unit Function Description:

●  LI: Overload protection (L) + Instantaneous short-circuit protection (I).

●  LSI: Overload protection (L) + Short-time delay short-circuit protection (S) + Instantaneous protection (I).

●  LSIG: Adds ground-fault protection (G) to the LSI configuration.

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