ABB - Electrification ST203M-C50NA - ST203M-C50NA Miniature Circuit Breaker ST203M-C50NA Miniature Circuit Breaker C-Char., 5kA, 50A, 3P+NA
ABB - Electrification

ST203M-C50NA

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Overview

The ABB ST203M-C50NA Miniature Circuit Breaker (MCB) is a 3-pole + Neutral (3P+NA) protection device designed for industrial and commercial power distribution systems. Rated at 50A with a breaking capacity of 5kA, this MCB provides reliable overcurrent and short-circuit protection for circuits requiring simultaneous switching of all three phases and the neutral conductor. The C-characteristic trip curve ensures sensitive protection against overloads while tolerating moderate inrush currents typical of inductive loads such as motors and transformers. Engineered for compatibility with ABB’s ST203M series, the ST203M-C50NA features a compact design optimized for installation in distribution boards, control panels, and motor protection circuits. The 3P+NA configuration prevents phase imbalance, enhancing equipment longevity and operational safety. Constructed with high-quality materials, this MCB meets stringent industry standards for durability and consistent performance in challenging environments. Key specifications include a rated current (I_n) of 50A, 3+NA poles, and a 5kA breaking capacity. The device is part of ABB’s Electrification portfolio, a global leader in power and automation technologies, ensuring compatibility with a wide range of electrical infrastructure. Ideal for applications requiring precise overcurrent protection and neutral conductor switching, the ST203M-C50NA delivers measurable benefits in terms of safety, reliability, and compliance with electrical regulations. Common applications include motor protection circuits, distribution boards, control panels, and industrial machinery where balanced three-phase power with neutral switching is required. The C-characteristic makes it suitable for circuits with moderate inrush currents, such as lighting systems, small motors, and transformers. The 3P+NA configuration ensures balanced load distribution and prevents neutral overload, critical in systems with non-linear loads or harmonic distortion.
  • Rated current: 50A (I_n)
  • Poles: 3+NA (3-phase + Neutral)
  • Breaking capacity: 5kA
  • Trip curve: C-characteristic for moderate inrush currents
  • Compact design for installation in distribution boards and control panels

Specifications

Amperage Rating
50 A
Amperage Rating, Maximum
50 A
Amperage Rating, Minimum
50 A
Current Rating
50 A
Interrupt Rating
(240 V AC) 10 kA / (480Y / 277 VAC) 5 kA / (125 V DC) 10 kA
Number of Poles
3
Poles
3P+NA
Series
ST203M
Special Features
ST203M-C50NA Miniature Circuit Breaker ST203M-C50NA Miniature Circuit Breaker C-Char., 5kA, 50A, 3P+NA
Trip Type
C
Tripping Characteristic
C
Voltage Rating
(240 V AC) / (125 V DC)
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 breaking capacity of the ST203M-C50NA?

The breaking capacity is 5kA, as specified in the product catalog.

What is the trip curve characteristic of this MCB?

The ST203M-C50NA features a C-characteristic trip curve, suitable for inductive loads.

How many poles does the ST203M-C50NA have?

The device has 3 poles plus a neutral (3P+NA) for simultaneous switching.

What is the rated current of the ST203M-C50NA?

The rated current is 50A, as indicated in the catalog specifications.

Is the ST203M-C50NA compatible with ABB’s ST203M series?

Yes, the ST203M-C50NA is part of ABB’s ST203M series, ensuring compatibility with other devices in the series.

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.