Description
The CT-ERS.21S is a single-function electronic time relay from the CT-S timer range. It provides an ON-delay (delay on make) function with 10 time ranges from 0.05 s to 300 h. This time relay operates with a rated control supply voltage of 24 – 240 V AC / DC and has a 2 c/o (SPDT) output with contacts rated at 250 V / 4 A. A sealable transparent cover for protection against unauthorized changes is available as accessory. The device offers screw connection technology with double-chamber cage connection terminals. New original ABB part, traceable to the manufacturer. Availability and price on request.
Technical Specifications
| Function (from description) | ON-delay (delay on make) |
|---|---|
| Time Range (from description) | 0.05 s to 300 h |
| Rated Control Supply Voltage (from description) | 24 – 240 V AC / DC |
| Output (from description) | 2 c/o (SPDT) contacts rated 250 V / 4 A |
| Terminal Technology (from description) | double-chamber cage connection terminals |
| Product Net Width | 22.5 mm |
| Product Net Height | 85.6 mm |
| Product Net Depth / Length | 103.7 mm |
| Product Net Weight | 0.13 kg |
| Width | 22.5 mm |
| Height | 85.6 mm |
| Depth | 103.7 mm |
| Weight | 0.13 kg |
| EAN | 4016779851442 |
| Category | CT-S |
| Country of origin | Germany |
| Customs tariff number | 85364900 |
| Manufacturer standard delivery time | 5 days |
| Packaging unit | Box x 1 |
| Product status (supplier data) | Active |
Independent distributor — not an authorised ABB dealer. All technical parameters are taken verbatim from the official ABB product data for this exact order code; packaging, customs and delivery data come from the supplier list entry for the same code.





