ABB - Electrification Signature Partner Distributor
ABB - Electrification ST203M-B20NA - ST203M-B20NA Miniature Circuit Breaker ST203M-B20NA Miniature Circuit Breaker B-Char., 10kA, 20A, 3P+NA
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ABB - Electrification

ST203M-B20NA

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Overview

The ABB ST203M-B20NA is a 3-pole + Neutral miniature circuit breaker (MCB) from ABB's ST200M series, engineered for reliable overcurrent protection in low-voltage electrical installations. This specific model features a B-characteristic tripping curve, making it ideal for protecting circuits with low inrush currents, such as lighting and socket outlets. It offers a rated current (I n) of 20A and a rated breaking capacity (I c) of 10kA, ensuring robust protection against short circuits. The 3P+NA configuration provides comprehensive protection for three live conductors and the neutral line, enhancing safety and system integrity. Compliant with UL 1077 and CSA 22.2 No. 235 standards, the ST200M series MCBs are designed to meet stringent safety and performance requirements. The ST203M-B20NA is a dependable choice for residential, commercial, and light industrial applications where precise and sensitive overload and short-circuit protection is required. Its compact design facilitates efficient use of space in distribution boards and control panels. Manufactured by ABB - Electrification (SKU: ST203M-B20NA), this MCB is produced in Switzerland (CH). The ST200M series is characterized by its high breaking capacity of 10kA, providing a significant level of protection against fault currents. The B-characteristic ensures that the breaker trips within a specific range of overcurrents, typically 3 to 5 times the rated current, which is ideal for applications where the expected inrush current is relatively low. The inclusion of a neutral pole (NA) in the 3P+NA configuration is crucial for ensuring complete protection in systems where the neutral conductor carries current. This type of MCB is designed for direct mounting on DIN rails, facilitating easy installation and integration into existing electrical panels. The operational voltage for this series is typically 230/400V AC, suitable for standard low-voltage distribution systems. The ST203M-B20NA, as part of the ST200M series, benefits from ABB's extensive experience and commitment to quality in electrical protection devices.
  • 3-pole + Neutral (3P+NA) configuration for comprehensive protection
  • B-characteristic tripping curve suitable for low inrush current applications
  • Rated current (I n) of 20A and rated breaking capacity (I c) of 10kA
  • Compliant with UL 1077 and CSA 22.2 No. 235 standards
  • Compact design for efficient use of space in distribution boards and control panels

Specifications

Amperage Rating
20 A
Connection Type
DIN Rail
Current Rating
20 A
Interrupt Rating
(240 V AC) 10 kA / (480Y / 277 VAC) 10 kA / (125 V DC) 10 kA
Mounting Type
DIN Rail
Number of Poles
3
Poles
3P+NA
Series
ST203M
Series
ST200M
Special Features
ST203M-B20NA Miniature Circuit Breaker ST203M-B20NA Miniature Circuit Breaker B-Char., 10kA, 20A, 3P+NA
Trip Type
B
Tripping Characteristic
B
Voltage Rating
(240 V AC) / (125 V DC)
Voltage Rating
230/400 V AC
Package Dimensions (L x W x H)
2.72 IN x 2.76 IN x 3.46 IN
Package Dimensions (L x W x H)
6.9088 cm x 7.0104 cm x 8.7884 cm
Package Weight (Imperial)
1.550 L
Package Weight (Metric)
0.703 kg
Ground Lug

DNGL

Ground Lug
INTERLOCK UNIT,AR-12M(SEPERATE),GMC(D)-6~16M

83411621001

INTERLOCK UNIT,AR-12M(SEPERATE),GMC(D)-6~16M
ZCT,LZR-030(V),EMPR,EXP

76512124011

ZCT,LZR-030(V),EMPR,EXP
JB5-2 2 POLE JUMPER 5.2MM SPACING

1SNK905302R0000

JB5-2 2 POLE JUMPER 5.2MM SPACING
JB5-5 5 POLE JUMPER 5.2MM SPACING

1SNK905305R0000

JB5-5 5 POLE JUMPER 5.2MM SPACING
One-hole, metric conductor, standard barrel with window lug, 4-6mm wire, M8 stud hole.

LCMA6-8-C

One-hole, metric conductor, standard barrel with window lug, 4-6mm wire, M8 stud hole.

Frequently Asked Questions

What is the rated current of the ABB ST203M-B20NA?

The ABB ST203M-B20NA has a rated current (I n) of 20A.

What is the breaking capacity of the ST203M-B20NA?

The ST203M-B20NA has a rated breaking capacity (I c) of 10kA.

What tripping characteristic does the ST203M-B20NA feature?

The ST203M-B20NA features a B-characteristic tripping curve.

How many poles does the ST203M-B20NA have?

The ST203M-B20NA is a 3-pole plus Neutral (3P+NA) miniature circuit breaker.

What standards does the ABB ST203M-B20NA comply with?

The ABB ST203M-B20NA complies with UL 1077 and CSA 22.2 No. 235 standards.

Frequently Asked Questions about ABB - Electrification

What industries and applications are Jokab Safety products used for?

Jokab Safety products are specifically designed for machine safety applications across multiple critical industrial sectors, including Food and Beverage, Packaging, and Material Handling industries. Their safety solutions cover a wide range of machine safeguarding needs, such as safety light guards, safety controllers, safety relays, safety edges, safety mats, and two-hand control devices that protect personnel and equipment in complex industrial automation environments.

What technical support does Jokab Safety offer?

Jokab Safety offers comprehensive technical support through multiple channels, including a dedicated technical support phone line at (888) 385-1221 (Option 1) and email support at [email protected]. For advanced technical assistance, customers can contact their specialized Jokab Tech Support at (519) 982-0976 or email [email protected]. Additionally, they provide product specialist support through Jeff Leslie, who can be reached at (519) 982-0976, offering in-depth application and technical guidance.

What are the main product lines offered by Jokab Safety?

Jokab Safety offers a comprehensive range of machine safety products including safety light guards (Orion), safety controllers (Pluto), safety relays (Sentry), safety edges, safety contact mats, safety locks (Gkey), and safety sensors with OSSD and DYNlink interfaces. Their product lines are specifically designed for industrial applications in food and beverage, packaging, and material handling industries, providing robust safety solutions for machine guarding and personnel protection.

What are the key features of Jokab Safety products?

Jokab Safety products offer comprehensive industrial safety solutions with key features including: highest safety certification levels (up to PL e/Cat 4), extensive fault detection, multiple safety device types (optical safety devices, pressure sensitive devices, sensors, switches, locks, emergency stops), and innovative DYNlink technology that reduces cable requirements and simplifies installation. Their products are certified, verified, and compatible with major industrial automation systems like B&R, featuring easy M12 connector connections and a wide range of adapters to streamline safety implementation.

What certifications and standards do ABB - Electrification products comply with?

ABB - Electrification products comply with a comprehensive range of international certifications and standards, including UL (United States), CSA (Canada), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia & New Zealand). Our products meet critical international standards such as IEC 60947 series for low-voltage switchgear, functional safety standards EN 61800-5-2 and ISO 13849-1, and marine classification standards from Bureau Veritas, DNV, and Lloyd's Register of Shipping.

What industries and applications are ABB - Electrification products used for?

ABB - Electrification products are engineered for critical applications across multiple industries, including Energy, Oil & Gas, Manufacturing, Power Generation, HVAC, Marine, Food & Beverage, Mining, Pulp & Paper, Water Treatment, and Automotive. Their solutions cover essential electrical infrastructure needs such as switchgear, power distribution systems, circuit protection, digital control technologies, and drive systems designed for high-reliability environments with a strong focus on sustainability, efficiency, and safety.

What technical support does ABB - Electrification offer?

ABB - Electrification offers comprehensive technical support through multiple channels, including a dedicated technical support hotline at 888-385-1221 (Option 1), available 7:00 a.m. - 5:00 p.m. CST, Monday-Friday. Their support services encompass 24/7/365 emergency services, on-site support, remote monitoring and diagnostics, installation and commissioning, equipment assessments, repair coordination, and multi-vendor technical assistance. Customers can also access resources like personnel safety training, disaster recovery support, and service agreements tailored to their specific electrification needs.

What are the main product lines offered by ABB - Electrification?

ABB - Electrification offers a comprehensive range of electrical distribution and protection products, including circuit monitoring systems, panelboards, switchgear, motor control centers, circuit breakers, softstarters, and power distribution solutions. Key product lines span low and medium voltage applications across utilities, commercial, industrial, healthcare, and manufacturing sectors, with specialized offerings like the ReliaGear® panelboards, SMISSLINE TP bus systems, and Ekip UP protection and metering relays.

What are the key features of ABB - Electrification products?

ABB - Electrification products feature advanced integrated design elements that enhance industrial performance and reliability. Key features include harmonics and EMC design, integrated DC choke, removable terminals for fast installation, USB ports for troubleshooting, and integrated Safe Torque Off (STO) functionality. The products deliver superior motor control capabilities, support both induction and permanent magnet motors, and offer robust operational features like side-by-side mounting without derating and operation at temperatures up to 45°C. Additionally, ABB's Electrification solutions emphasize digital innovation, with technologies like Novolink enabling predictive maintenance, enhanced analytics, and seamless system integration.

What communication protocols do ABB - Electrification products support?

ABB - Electrification products support a comprehensive range of industrial communication protocols, including Modbus RTU, PROFIBUS DP, PROFINET, EtherNet/IP, CANopen, DeviceNet, and IEC 61850. These protocols enable flexible connectivity across multiple industrial automation platforms, with support for various network topologies and high-speed data transmission up to 100 Mbps.