QFA-24-230 Field Parallel Surge Protector (220VAC+24VDC Hybrid Protection)
For four-wire instruments supplied at 220 V AC, etc. Function: line-to-line low residual voltage protection, for LPZ0B to LPZ2 zones and subsequent zone boundaries.
- Original Factory Genuine, Tenfold Compensation for Counterfeits
- Full Machine Warranty, Lifetime Maintenance
- In Stock, Shipped on the Same Day
The QFA series field tubular parallel surge protectors are used to protect signal detection and control equipment, preventing external interference such as transient surges and transient voltages caused by lightning strikes or high-voltage switching. By discharging transient currents to earth, the voltage between signal lines is clamped at a safe level, ensuring normal signal transmission.
Ordering code:QFA-24-230-□; □: N=1/2″NPT, I=M20×1.5, X/Y/Z for custom threads.
| Parameter Name | Technical Specifications |
|---|---|
| Signal protection | |
| Nominal voltage UN | 24V |
| Maximum continuous DC operating voltage UC | 33V |
| Nominal current (80 °C) IL | 0.55A |
| D1 impulse current Iimp (10/350 μs) | 1kA |
| C2 total nominal discharge current In (8/20 μs) | 10kA |
| Power supply protection | |
| Nominal AC voltage L/N | 230V |
| Maximum continuous AC operating voltage UC | 275V |
| Nominal discharge current L-N In (8/20 μs) | 3kA |
| Total discharge current L+N-PE Itotal (8/20 μs) | 6kA |
| Voltage protection level L/N-PE UP | ≤1.5kV |
| Maximum backup fuse | 16AgG or B16A |
| Mechanical & Environmental | |
| Degree of protection | IP67 |
| Response time Ta | <1 ns |
| Operating temperature range TU | -40℃～+80℃ |
| Housing material | 304 stainless steel (316 or 316L available on request) |
| Output conductor specification | 1.5mm², 25cm long, stranded wire, abrasion-resistant |
| Thread (instrument side/equipment side, parallel) | M20×1.5, 1/2"NPT etc., customizable |
- For four-wire instruments powered by 220VAC
- Hybrid protection circuit design, strong surge immunity
- M20×1.5 and other thread options
- Field parallel installation
- 304 stainless steel housing (316/316L available on request)
- For four-wire measurement and control systems with 230V power supply.
Field instrument surge protection
Hybrid surge protection for four-wire instruments powered by 220VAC (signal 24VDC + power 230VAC), field parallel installation.
Need selection advice or bulk quotation?
Send us the working condition parameters (signal type, medium, range, pressure, temperature, connection method), and our engineers will provide a selection scheme and quotation within 1 working day.
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