1SDA126644R1 ABB RC Protection E1.3…E6.3 – Offline

Why Choose the ABB RC Protection E1.3...E6.3 - Offline Upgrade?

The ABB RC protection E1.3...E6.3 - Offline (1SDA126644R1) is a SACE Emax 3 digital protection upgrade that enables residual-current (RC) protection on compatible Ekip Aware circuit breaker configurations. It is supplied as an offline ABB Marketplace upgrade rather than as a protection function factory-configured with the breaker.

RC protection is designed to detect differential earth-fault current using a dedicated external ABB RC toroid. The toroid monitors the vectorial sum of the currents passing through the conductors and enables the Ekip Aware trip unit to issue a trip command when the measured residual current exceeds the configured threshold for longer than the selected delay.

ABB specifies an adjustable RC protection threshold from 3–30 A and a trip-time setting from 0.05–0.8 s. Correct operation requires the appropriate external RC toroid and a suitable Ekip power-supply arrangement. This digital upgrade provides a flexible way to add differential ground-fault protection to an eligible Emax 3 installation.

Key Advantages

• Genuine ABB SACE Emax 3 digital protection upgrade.
• Adds RC residual-current protection to compatible Ekip Aware configurations.
• Detects differential earth-fault current through a dedicated external RC toroid.
• Adjustable residual-current threshold from 3–30 A.
• Adjustable trip-time delay from 0.05–0.8 s.
• Offline upgrade format allows the protection capability to be added to an eligible existing configuration.

Key Features

• ABB Emax 3 RC protection digital upgrade.
• Order code 1SDA126644R1.
• Offline / ABB Marketplace protection upgrade.
• Designed for use with Ekip Aware.
• Provides differential ground-fault protection.
• Uses a dedicated external RC toroid for residual-current measurement.
• 3–30 A adjustable residual-current threshold.
• 0.05–0.8 s adjustable protection delay.
• Automatic RC protection activation when the external toroid type is configured as RC.
• Provides monitoring of the connected RC toroid and an alarm if the trip unit does not detect the sensor.

Residual-Current Protection for SACE Emax 3

ABB's RC protection monitors the current measured by a dedicated external residual-current toroid. Under normal operating conditions, the vectorial sum of the currents passing through the toroid is approximately zero. When current leaks to earth, a residual current appears; if this exceeds the configured RC threshold for the selected time delay, the protection sends a trip command to the circuit breaker.

The function is particularly useful where conventional overcurrent or earth-fault protection alone may not provide the required response to lower-magnitude earth-leakage currents. The RC digital upgrade operates together with the appropriate ABB external toroid and requires a suitable auxiliary or busbar-derived power supply for correct operation.

Typical Applications

• ABB SACE Emax 3 installations requiring residual-current protection.
• Industrial low-voltage power distribution systems.
• TT and suitable TN-S electrical distribution systems.
• Manufacturing and process-industry switchboards.
• Commercial and infrastructure power distribution.
• Applications requiring enhanced detection of differential earth-fault currents.