EA-SCB series Serial Connection Box
Designed for seamless series connection of power devices up to 3000 V DC, the SCB enables efficient, reliable, and compact power transmission across railway, aviation, and renewable energy sectors. The SCB empowers engineers to meet modern energy demands with confidence and flexibility.
Empowering High-Voltage Demands
- HVDC solutions for a wide application range.
As technology advances, the demand for smarter, stronger power solutions grows. High-voltage DC (HVDC) systems in rail, renewable energy, and aviation are pushing the limits of performance.
EA Elektro-Automatik’s Serial Connection Box is built to meet this challenge—delivering the voltage, reliability, and efficiency modern industries need to thrive.
- Voltage rating 0–360 V up to 0–1500 V
- Max # of units to Connect 2–3
- Max system voltage 1000 V–3000 V
Ships with
- SCB B unit
- Cable set
- Sense cover
- Datasheet
For series-connected devices
Devices from EA Elektro-Automatik can be connected in series to meet the demand of higher voltages up to 3000 V DC. To ensure the safety, the use of the Serial Connection Box (SCB) is necessary. The SCB protects the devices in series connection from exceeding the specified insulation voltage, ensuring safe operation. In addition, EA’s systems can be used flexibly with the help of the SCB.
The devices can be used individually or connected in series. For example, two parallel-connected groups can be connected in series to create systems with high voltage and high power to meet corresponding market requirements.
Description
The SCB measures the DC voltage at the DC terminal of the EA device. If the voltage at the DC terminal is higher than the permissible voltage (e.g. SCB 360 V, 360 V (+tolerance)), the SCB short-circuits the share bus, which leads to a share bus fail (SF) on the EA devices (see EA 10.000 series manual).
In addition, the SCB forwards the OVP signal to all other connected SCBs, which in turn short-circuits the share bus to switch Off the DC terminals of all devices. ln this situation, the internal resistance of the various EA devices can be equalised again, so that the overvoltage situation is
rectified after the DC terminal has been enabled again.
The short circuit on the share bus is active as long as the SCB detects an overvoltage situation. This ensures that the DC terminal of the EA device cannot be released until the overvoltage situation has been rectified. Once the overvoltage situation has been rectified, the DC terminal
can be reactivated by acknowledging the SF on each EA device.
Each EA device in a series connection must be equipped with an SCB. ln the case of a series and parallel connection of EA devices, e.g. 3 parallel devices in series with 3 parallel devices, only one device per 3 parallel devices must be equipped With an SCB.
The green LED (OK) indicates that the device is working.
The red LED (OVP) indicates an overvoltage situation.