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# Miniature Circuit Breakers MCBs
## UL 489 and UL 1077 – designed for AC and DC
MCBs are essential components in electrical systems. They are designed to protect applications and electrical loads against the dangerous consequences of overcurrents.
In the following, we’ll explain in detail how the UL 1077 and UL 489 standards specify MCBs and why they are so important.
While MCBs according to UL 1077 provide additional protection for low voltage applications, the MCBs according to UL 489 are designed to provide reliable protection for a wide range of applications and voltage ranges.
### Typical applications:
* Automotive manufacturing
* Chemical, oil and gas industry
* Automation and building technology
* Telecommunications and data centres
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## Videos: How to mount the add-on modules
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## Our MCB portfolio
Our thermal-magnetic MCB portfolio (4230-T) includes both UL 1077 and UL 489 versions have rated currents from 1 to 63 A with different characteristics and numbers of poles. The 4230-T...U  product group (UL 489) is suitable for circuit protection in AC or DC networks, the 4230-T...E product group (UL 1077 / EN 60947-2) is designed for additional protection.
The application example according to UL 508 shown here illustrates the wide range of applications.
The **UL 508A** standard specifies the requirements for the construction and installation of control panels to ensure that they comply with electrical safety standards. Among other things, the standard covers the design, wiring and operation of control panels and guarantees that they can control electrical systems safely and reliably.
Our 4230-T MCB is suitable for use in switchgear according to UL 508A. Each load can be individually protected according to the standard.
## Busbars and further connection accessories
Jumpers, also called busbars, are used for electrical connections and power distribution between switchgear. You can select the correct busbars and suitable accessories, such as end caps, connection terminals and cover caps, for your application from our portfolio.
## Our products
4230-T (UL 1077 / EN 60947-2)
Single pole and multipole thermal-magnetic miniature circuit breakers (MCBs) in accordance with EN 60947-2 and UL 1077
4230-T (UL 489)
Single pole and multipole thermal-magnetic miniature circuit breakers (MCBs) in accordance with UL 489
X4230-A
X4230-A fault indicator for the 4230-T MCB
X4230-FA
Operating current breaker X4230-FA for 4230-T
X4230-S
Auxiliary switch X4230-S for circuit breaker 4230-T
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[Datasheets, CAD, Manuals, etc.
Looking for CAD drawings, technical documentation, and more? Visit the download center for everything you need to specify E-T-A products.
[Interactive Virtual Sample Kit
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## Need to get in touch?
Click on the buttons below to contact E-T-A directly.
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About E-T-A
E-T-A is the world market leader for circuit breakers for equipment protection and circuit protectors. We offer you the world’s most comprehensive product portfolio in the areas of overcurrent protection, power distribution, circuit breakers for equipment protection, power- and solid state relays and intelligent, complete systems.
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E-T-A Elektrotechnische Apparate GmbH. All rights reserved.
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# Relays & Solid State Remote Power Controllers
## Solid state relays and power relays for vehicles:
The automotive portfolio offers a wide range of high-end relays, particularly suitable for use in passenger cars, buses, trucks, specialty vehicles and emergency vehicles,construction machinery, forestry equipment and agricultural vehicles.
## Solid state remote power controllers for factory automation:
They offer reliable protection, switching and monitoring of DC 24 V circuits and loads. Typical applications are in the steel industry, automation and chemical production.
Solid state relays
Power relays
Solid State Remote Power Controllers
Special relays
Timer relays
High voltage relay
# Solid state relays
## Applications
The solid state relay portfolio is used in all applications where mechanical relays reach their limits. They switch more frequently, quieter and faster than mechanical relays and are particularly suitable for applications in buses and trucks, in agricultural vehicles and construction machinery, in specialty vehicles and passenger cars.
 E-T-A solid state relays are available for DC 12 V and DC 24 V applications and are suitable for standard automotive relay sockets to ISO 7588.
## Technical design
Solid state relays combine high-end power semi-conductors with comprehensive know-how in the areas of heat management, EMC-compliant design and overcurrent protection. The electronic circuitry ensures wear-free, silent and extremely fast switching operations over the entire life span.
ESR10
Electronic standard relays type ESR10 Micro
# Solid State Remote Power Controllers
Solid state remote power controllers are used for reliable protection, switching and monitoring of DC 24 V circuits and loads in the steel industry, automation and chemical industry.
SSRPCs are suitable for reliable switching, protecting and monitoring of resistive and inductive loads.  The offer a range of functions including overload and short circuit protection as well as wire break detection, they help to avoid consequential damage or system downtimes, thereby reducing costs.
Product comparison
E-1048-S6xx
Solid State Remote Power Controller (DC 24 V, max. 4A), providing protection and signalisation
E-1048-S7...
Solid state remote power controller E-1048-S7... (DC 24 V, max. 5 A)
E-1048-8I...
Smart Power Relay (DC 9...32 V, max. 10 A), remotely controllable electronic load disconnection relay
E-1072-100
Double pole SSRPC (DC 24 V, max. 3 A), 2 fault indications
E-1072-128
Double pole SSRPC (DC 24 V, max. 3 A)
E-1072-210
Double pole SSRPC (DC 24 V, max. 2 A), 2 fault indications, 1 status indication
# Power relays
Power relays are reliable problem solvers when it comes to switching high currents. Particularly construction machinery, agricultural vehicles as well as buses and trucks, floor-borne vehicles and other special vehicles (e.g. fire brigades) often have connected large electrical loads. In these applications, power relays disconnect the entire on-board electrical system from the battery.
Depending on the application, E-T-A offers purely electro-mechanical relays, solid state relays and also a hybrid design consisting of an electro-mechanical switching system with an intelligent electronic control unit.
EPR10
Solid state power relay in a flat design with optional overcurrent detection and disconnection
HPR10
Hybrid power relay consisting of a bistable electro-mechanical switching system and integral electronic control unit
MPR10
Mechanical Power Relays. Bistable electro-mechanical power relay, also suitable for 48V applications
MPR20
Monostable electro-mechanical power relay with power-saving electronic control circuitry
# Type MPR20
91,3 mm
## Description
The MPR20 is a monostable electro-mechanical power relay. Its integral electronic control circuitry helps reduce power consumption in the holding power by the factor 10 compared to standard power relays. It can both switch and carry 300 A. In the event of a power disruption, the relay will at once go into its original state due to its monostable design. This provides more safety and reliability. Reduction of holding power and of the pull-in power allows direct connection to the controlgear and provides additional cost reduction and environmental advantages despite a monostable design. By using standard termination technologies and mounting dimensions, the MPR20 can easily and quickly replace conventional relays.
* Reduced fuel consumption and CO2 emission due to an 90 % lower holding power
* Flexible installation for demanding applications due to a robust, waterproof and dust-proof design
* Reduced installation time through direct connection to the controlgear
**NEW!** Now also available with robust plug-in connector - compatible with the HDSCS connector series
 **NEW!** Extension to 48 V in the load circuit
**Saves time and costs**
* through quick and fault-free mounting
* thanks to isolation of the control contacts from environmental influences
* through high resistance against vibration and mechanical stress
## Technical Data
| Voltage rating | DC 12 V DC 24 V DC 48 V |
| --- | --- |
| Operating voltage | DC 16...32 V DC 9...16 V |
| Continuous current | 100 A 200 A 300 A |
| Number of poles | 1-pole |
| Temperature range | -40 °C …. + 85 °C |
| Terminal design | Load terminals M8 or M10 |
| Mounting method | M4 connectors side and foot foot flange holes with compression limiter side flange |
| Design | Cylindrical enclosure |
| Feature | Mechanical power relay for harsh application conditions. |
| Contact system type | mechanical |
| Certificates | KBA E1 (ECE-R10) |
* Automated guided vehicles (AGV)
* Automobiles
* Commercial Vehicles
* Forklifts
* Rail vehicles
* Watercraft & Vehicles
## Downloads
Datasheet & Explanations
*  1.8 MB
  3.4 MB
  3.0 MB
  2.7 MB
  4.1 MB
  2.5 MB
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