CR-M4SS: relay-socket wiring and contact-layout review
ABB CR-M4SS is a standard screw-terminal socket for compatible CR-M plug-in relays. ABB identifies order code 1SVR405651R3000 and suitability for CR-M relays with two or four changeover contacts. The socket itself has no relay coil.
Technical data for identification
| Technical item | Verified value / selection note |
|---|---|
| Type designation | CR-M4SS |
| ABB order code | 1SVR405651R3000 |
| Product type | Standard socket, not an energized relay |
| Terminations | Screw terminal connection |
| Relay compatibility | CR-M relays with 2 or 4 changeover contacts |
| Coil voltage | Determined by separate inserted relay |
| Contact rating | Determined by the selected relay and socket assembly |
For a low-voltage control or protection device, distinguish its stated function from the other devices in the feeder. Confirm supply, load category, wiring diagram, upstream coordination and required local approvals.
Field checks and acceptance
Commissioning of CR-M4SS should follow a controlled procedure. De-energize both coil and switched circuits, inspect socket contacts for heat and looseness, and fit the correct relay. Prove each changeover contact and the control sequence before returning the panel to service.
Capture the as-left settings, test points, abnormal-state response and revision of CR-M4SS. Include photographs of its nameplate and terminal arrangement so the next service event can be traced.
Where this configuration fits
CR-M4SS should be assessed in the actual equipment arrangement. Use the socket to make relay replacement and panel wiring orderly. Map the actual inserted relay's coil, contact sets and pinout to the cabinet drawing; the socket name alone does not establish a control voltage or switched-load rating.
A request for CR-M4SS should identify the host system, process or motor duty, available supply and the expected normal and fault behavior. This makes the selection review specific to the installed equipment.
Order-code and compatibility review
For CR-M4SS, Confirm the selected CR-M relay variant, retaining accessory, mounting rail, terminal conductor size and wiring identification. Do not assume CR-P or another relay family shares the same contact map merely because it is pluggable.
Before substituting CR-M4SS, compare the complete label with the engineering drawing, ABB configuration data, installed accessories and site approval record. A partial designation or a similar enclosure cannot establish interchangeability.
Related configuration references
The following CR-M4SS family references are identification aids. Ratings, options and approvals can differ; each complete designation needs its own review.
- 1SVR405651R3000
- CR-M110DC4L+CR-M4SS+CR-MH1
- CR-M4SS 1SVR405651R3000
Information to send with a replacement inquiry
Provide the exact model CR-M4SS, quantity, serial or revision, application conditions, required connection and approval, and a legible nameplate photograph. Ask for confirmation of accessories and any approved successor.
Keep CR-M4SS in the asset register and maintenance record as the exact search phrase. Record who approved the selected device, what was tested and whether the installed configuration differs from the base family specification.
Final engineering decision
Approve CR-M4SS only when the verified ratings and ordered options match the equipment record. Resolve every discrepancy in code, connection, supply, firmware or process limit before energizing the system.
The published family values for CR-M4SS support identification and initial selection. The device nameplate, matching ABB instructions and the site's approved design determine final suitability.
