CM-EFS.2S selection: measurement range, trip threshold and circuit coverage
CM-EFS.2S is an ABB electronic earth-fault monitoring relay identified by order code 1SVR730750R0400. ABB selection data lists this code in the CM-EFS family and distinguishes screw-terminal and push-in variants. Select the measurement range and threshold from the exact data sheet; do not infer pickup current from the family name or a neighboring CM-ESS model.
Key technical data
| Technical item | Verified value / selection note |
|---|---|
| ABB order code | 1SVR730750R0400 |
| Type | CM-EFS.2S electronic monitoring relay |
| Supply | 24–240 V AC/DC family variant |
| Measurement | Earth-fault / residual-current monitoring family |
| Range | Several measurement ranges are shown in ABB selection tables; verify exact unit |
| Outputs | Confirm relay output count and contact rating from the product data sheet |
| Mounting | Control-panel rail mounting; verify environmental limits |
Integration path
Treat CM-EFS.2S as one link in a defined system path. Trace the signal or power from its source, through this device, to the controller or final element, then verify feedback and abnormal-state behavior.
CM-EFS.2S is considered where an installation needs monitoring of residual or earth-fault current and a relay output for alarm or control response. The protection strategy depends on the sensor path, conductor routing, threshold, delay and coordination with upstream protection. A monitoring relay does not replace a suitably rated protective device unless the complete protection design explicitly provides that function.
Selection and compatibility checks
For 1SVR730750R0400, verify the monitored current range, transformer or sensor arrangement, supply voltage, trip threshold, delay, output contacts and terminal style. Route all required conductors consistently through the sensing arrangement and check that the selected setting matches the installation's leakage and fault-current requirements. Confirm the unit's exact suffix and current product status.
For CM-EFS.2S, establish the equipment boundary before procurement: record the host controller or panel, the connected field device, the installed hardware and firmware revisions, the supply source, the protection method and the required operating sequence. A family-name match is not enough to confirm that CM-EFS.2S is a compatible replacement. Check all interfaces and accessories against the exact ABB documentation.
Commissioning and acceptance
Test CM-EFS.2S with an approved injection or test method, prove the relay threshold and delay, and confirm that the alarm or trip circuit responds correctly. Record the sensor ratio, wiring route, settings and downstream action so periodic testing remains reproducible.
A practical acceptance record for CM-EFS.2S should include the nameplate photograph, order code, terminal and connector condition, configuration or setting values, software revision where applicable, test equipment and measured results. If CM-EFS.2S is installed as part of a larger system, record the system-level response as well as the local device indication.
Related same-series designations
These CM-EFS.2S references identify related options or configurations, not automatic substitutes. Check each complete model code, ratings, connection method and compatibility before selection.
- 1SVR730750R0400
- 1SVR730750R0400 (CM-EFS.2S)
- CM-EFS.2S, 1SVR730750R0400
Procurement and maintenance handover
When requesting a quotation for CM-EFS.2S, provide the full designation, ABB order number, quantity, installed revision, application voltage, connected load or field-device type, required approvals and delivery destination. Ask the supplier to confirm that the supplied CM-EFS.2S matches the stated hardware and accessory configuration. Do not substitute a neighboring family code without engineering review.
