NewTrend · Off-delay timer relay
Product overview
NewTrend RT8-Bt is an off-delay timer relay with 1 timed SPDT + 1 instantaneous SPDT output contacts. Timing is adjusted using a marked range selector and a 10%-100% potentiometer. The relay fits an 18mm DIN-rail module and has separate supply and output indicators. Choose AC/DC 12-240V (W240) or AC 230V (A230) control supply.
Technical selection summary
| Model | RT8-Bt |
|---|---|
| Output contacts | 1 timed SPDT + 1 instantaneous SPDT |
| A230 power input | AC maximum 6VA / 1.9W |
| Weight | W240: 81g; A230: 80g |
| Function | Off-delay with instantaneous auxiliary contact |
| Supply terminals | A1-A2 |
| Control supply options | W240: AC/DC 12-240V; A230: AC 230V; 50-60Hz |
| Supply tolerance | -15% to +10% |
| W240 burden | AC 0.09-3VA / DC 0.05-1.7W |
| Supply indication | Green LED |
| Time setting | Range selector and 10%-100% potentiometer |
| Adjustment range | 0.1s-10days; ON; OFF |
| Marked time ranges | 1s, 10s, 1min, 10min, 1h, 10h, 1day, 10days; ON and OFF positions |
| Time setting deviation | 10% with mechanical adjustment |
| Repeat accuracy | 0.2% of set value |
| Temperature coefficient | 0.05%/degree C at 20 degrees C |
| Contact rating | 16A, AC-1 |
| Switching voltage | 250VAC / 24VDC |
| Minimum DC breaking power | 500mW |
| Output indication | Red LED |
| Mechanical life | 10,000,000 operations |
| Electrical life (AC-1) | 100,000 operations |
| Reset time | Maximum 200ms |
| Operating temperature | -20 to +55 degrees C |
| Storage temperature | -35 to +75 degrees C |
| Mounting | DIN rail to EN/IEC 60715 |
| Protection | IP40 front panel; IP20 terminals |
| Operating position | Any |
| Overvoltage category | III |
| Pollution degree | 2 |
| Maximum conductor size | Solid: 1 x 2.5mm2 or 2 x 1.5mm2; with sleeve: 1 x 2.5mm2 (AWG 12) |
| Terminal tightening torque | 0.4Nm |
| Body dimensions | 90 x 18 x 64mm |
| Referenced standards | EN 61812-1; IEC 60947-5-1 |
Select the control supply to match the installation. Set the required timing range and percentage before use. Confirm load type and utilization category when enquiring.
Typical applications
- Delayed switching of control circuits
- Fan and pump sequencing
- Applications with defined timing requirements
Specify your enquiry
For a focused quotation, include:
- Control supply version: W240 or A230
- Required off-delay interval and load characteristics
- Quantity, delivery destination and documentation requirements
Download NewTrend RT8-Bt datasheet (PDF)
Product reference images and drawings
Wiring diagram
Off-delay timing diagram
Common housing dimensions (RT8-A2 front view)
Delay = marked range x fine-adjustment percentage. The ON and OFF positions hold the timed output on or off. Refer to the timing diagram for control-input operation. Isolate power before wiring; installation must be performed by qualified electricians.
