NewTrend · single-phase automatic transfer switch
Product overview
NewTrend PS8-17 monitors two AC 220V single-phase sources and automatically transfers one single-phase load between them. Inputs are L1-N1 and L2-N2, with L-N output. Select L1, L2 or AUTO priority and configure voltage, overcurrent and recovery timing for the installation. The 63A AC-1 version shown here provides digital source-voltage and load-current indication. N1 and N2 are internally connected, so suitability must be checked for the source earthing and neutral arrangement.
Technical selection summary
| Model | PS8-17 |
|---|---|
| Published version | 63A, AC-1; AC 220V |
| Function | Single-phase automatic transfer switch |
| Supply inputs | L1-N1 and L2-N2; two single-phase sources |
| Load output | L-N; single-phase |
| Neutral arrangement | N1 and N2 internally connected |
| Rated supply voltage | AC 220V per L-N input |
| Supply frequency | 45-65Hz |
| Operating voltage range | 80-400V per L-N input |
| Rated operational current | 63A, AC-1 |
| Power input | Maximum 3VA |
| Priority modes | L1 / L2 / AUTO |
| Overvoltage setting | OFF or 230-300V |
| Overvoltage recovery | 225-295V |
| Undervoltage setting | 140-210V or OFF |
| Undervoltage recovery | 145-215V |
| Voltage-fault action delay | 0.1-10s |
| Overcurrent setting (63A version) | OFF or 1-63A |
| Overcurrent action delay | 2-600s |
| Power-up delay | 2-600s |
| Reset delay | 2-900s |
| Switching delay setting | 0-900s |
| Actual transfer at 0s setting | Approximately 0.2s, per factory note |
| Fault-reset modes | ON / OFF |
| Measurement error | ≤1% |
| Electrical life (AC-1) | 10,000 operations |
| Mechanical life | 1,000,000 operations |
| Operating temperature | -20 to +60°C |
| Storage temperature | -35 to +75°C |
| Mounting | DIN rail to EN/IEC 60715 |
| Protection | IP40 front panel / IP20 terminals |
| Operating position | Any |
| Overvoltage category / pollution degree | III / 2 |
| Body dimensions | 82 x 72 x 68mm |
| Weight | 280g |
| Isolation function | Not provided; disconnect upstream circuit breaker(s) before maintenance |
Operation
- Connect source 1 to L1-N1 and source 2 to L2-N2; connect the load to L-N. The source neutrals are internally common.
- Choose L1, L2 or AUTO priority. With L1 priority, L1-N1 is the main supply.
- Set overvoltage to OFF or 230-300V and recovery to 225-295V. Set undervoltage to 140-210V or OFF and recovery to 145-215V. Voltage-fault delay is 0.1-10s.
- For this 63A version, set overcurrent to OFF or 1-63A with a 2-600s action delay. Power-up delay is 2-600s and reset delay is 2-900s.
- Switching delay is adjustable from 0-900s. The factory specifies approximately 0.2s actual transfer when the setting is 0s. Fault-reset mode can be enabled or disabled; refer to the original timing diagrams.
- Hold M for 3s to enter settings and hold for 3s to save. A 0.5s power-button press manually switches the load on or off during normal operation.
Typical applications
- Single-phase main/backup supply panels with compatible common-neutral sources
- Inverter/utility transfer applications following the exact factory wiring and neutral limitations
View or download PS8-17 original catalogue, September 2026 (PDF)
Product reference images and drawings
Exact-model ratings, panel indications and factory settings
Parameter-setting sequence and manual operation
Priority selection and fault timing diagrams
Original application wiring, limitations and dimensions
N1 and N2 are internally connected; this device is unsuitable where the two sources require neutral separation. It has no isolation function: disconnect the upstream circuit breakers before maintenance. The switching-time setting is 0-900s, but the factory states that a 0s setting gives approximately 0.2s actual transfer time. Provide coordinated upstream circuit and short-circuit protection. Installation and wiring must be performed by qualified electricians.
