CT-MFS.21S timer application: function choice, time range and output sequencing
ABB CT-MFS.21S (order code 1SVR730010R0200) is a multifunction electronic time relay in the CT-S range. ABB product material specifies ten timing functions, ten time ranges from 0.05 s to 300 h, a 24–240 V AC/DC control supply and two changeover outputs. The selected timing function and actual load determine how the relay should be wired and applied.
Key technical data
| Technical item | Verified value / selection note |
|---|---|
| ABB order code | 1SVR730010R0200 |
| Type | CT-MFS.21S multifunction electronic time relay |
| Supply | 24–240 V AC/DC |
| Timing functions | 10 functions in the CT-S range |
| Time range | 0.05 s to 300 h family specification |
| Outputs | 2 c/o (SPDT), contacts rated 250 V / 4 A per catalog |
| Connection | Screw terminals, double-chamber cage |
Role in the control or protection system
CT-MFS.21S can provide delay, interval or sequencing behavior in control panels where a dedicated timer is preferable to PLC logic. Before using it for a process sequence, consider what happens on loss of supply, power restoration, trigger bounce and repeated commands. It is not a safety relay and should not perform a safety function unless specifically designed and certified for that purpose.
Selection and compatibility checks
For 1SVR730010R0200, verify supply type, selected function, time range, trigger input type, contact loading and whether one output is configured as instantaneous. ABB specifies 250 V / 4 A contacts in the family material; confirm the applicable utilization category and suppression for inductive loads. Similar CT-S codes can have different output counts or push-in terminals.
For CT-MFS.21S, 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 CT-MFS.21S is a compatible replacement. Check all interfaces and accessories against the exact ABB documentation.
Commissioning and acceptance
Set CT-MFS.21S using the approved timing diagram and verify the actual delay with a timer or logged signal. Test both outputs, trigger behavior and restart conditions across the required supply range. Record switch positions or settings, load type and the timing tolerance used for acceptance.
A practical acceptance record for CT-MFS.21S 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 CT-MFS.21S 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 CT-MFS.21S references identify related options or configurations, not automatic substitutes. Check each complete model code, ratings, connection method and compatibility before selection.
- 1SVR730010R0200
- 1SVR730010R0200,CT-MFS.21S,multifunction,2c/o,24-240VAC
Procurement and maintenance handover
When requesting a quotation for CT-MFS.21S, 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 CT-MFS.21S matches the stated hardware and accessory configuration. Do not substitute a neighboring family code without engineering review.
