ABB - Electrification Signature Partner Distributor
ABB - Electrification ST203M-Z50 - ST203M-Z50 Miniature Circuit Breaker ST203M-Z50 Miniature Circuit Breaker Z-Char., 5kA, 50A, 3P
ABB - Electrification

ST203M-Z50


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Specification Sheet

Contact for Pricing

Overview

The ABB ST203M-Z50 is a 3-pole miniature circuit breaker designed for industrial power distribution and motor control applications. Rated at 50A (I_n) with a 5kA interrupting capacity, this breaker provides reliable protection against overcurrents and short circuits. The Z-characteristic tripping curve ensures rapid response to transient overcurrents, making it ideal for protecting sensitive electronic equipment and preventing damage to critical machinery. Manufactured in Switzerland (CH) by ABB - Electrification, the ST203M-Z50 complies with IEC 60947-2 standards, ensuring consistent performance in demanding industrial environments. Its compact 3-pole design facilitates installation in control panels and motor control centers where space is a consideration. The breaker's robust construction and adherence to international standards guarantee long-term reliability and safety in three-phase systems. Key applications include motor control circuits, power distribution panels, and industrial machinery where precise overcurrent protection is required. The ST203M-Z50 is optimized for systems requiring fast tripping to safeguard sensitive loads while maintaining operational continuity.
  • Rated current: 50A (I_n)
  • Interrupting capacity: 5kA
  • Tripping curve: Z-characteristic for rapid response
  • Number of poles: 3
  • Compliant with IEC 60947-2 standards
  • Manufactured in Switzerland (CH)
  • Compact design for space-efficient installation

Specifications

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
Mounting Type
DIN Rail
Number of Poles
3
Poles
3P
Series
ST203M
Special Features
ST203M-Z50 Miniature Circuit Breaker ST203M-Z50 Miniature Circuit Breaker Z-Char., 5kA, 50A, 3P
Tripping Characteristic
Z
Voltage Rating
(240 V AC) / (125 V DC)
Package Dimensions (L x W x H)
2.72 IN x 2.07 IN x 3.46 IN
Package Dimensions (L x W x H)
6.9088 cm x 5.2578 cm x 8.7884 cm
Package Weight (Imperial)
0.860 L
Package Weight (Metric)
0.390 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 for the ST203M-Z50 circuit breaker?

The rated current for the ST203M-Z50 is 50A.

What are the voltage ratings for this miniature circuit breaker?

The rated voltage is 240/415 VAC and 250 VDC.

What is the interrupting rating according to UL 489?

The interrupting rating is 10kA at 240 VAC and 10kA at 250 VDC.

How many poles does the ST203M-Z50 have?

The ST203M-Z50 has 3 poles.

What is the tripping characteristic of this circuit breaker?

The tripping characteristic is Type Z.

What is the main product type for this breaker?

The main product type is ST203M.

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.