WTHB Fuse Switch Disconnector 3 Pole 160A to 630A
WTHB fuse switch disconnector in three poles, four frames 160A to 630A, AC400V and AC690V or DC1000V, making 10 times Ie, breaking 8 times, 50kA limit.
Solar Energy Equipments
WTAIELE supplies solar balance-of-system equipment: MC4 connectors, DC fuses, surge protection, boxes and transfer switches for PV installations.
What Goes on Each Side of the Inverter
A solar installation is easier to specify side by side with the inverter. On the DC side, the array needs connectors at the module leads, fuses where strings are paralleled, a DC surge device at the entry point, and a DC breaker or isolator for service work. Those parts are here: MC4 and MC4H connectors, WTDS 10×38 mm fuses, WTSP-D40 surge protection and WTM7-63 breakers.
On the AC side, the inverter output needs its own breaker and, where the site is exposed, an AC surge device. WTSP-A40 covers that side.
The rest of the category is the infrastructure around the array rather than the PV circuit itself: WT-HT surface boxes, Q3R and Q5 transfer switches where a generator backs the building, and WTXU and WTKA relays that monitor the supply the inverter runs on.
Solar Energy Equipments products
WHDS-32 DC Fuse Holder 10x38mm 1000V DC
WHDS-32 DC fuse holder for one Ø10x38mm link at 1000V DC, 20kA breaking capacity, 2.5 to 10mm2 terminals, IP20 cover and DIN rail mounting.
WHDS-63 DC Fuse Holder 1500V DC for 10x14x85 Fuses
WHDS-63 DC fuse holder for Ø10/14×85 fuses at 1500V DC, marked 1500V DC 50A, links from 1A to 25A, 20kA breaking capacity and a 2.5 to 10mm2 terminal.
WXU-03 Phase Failure and Phase Sequence Relay
WXU-03 phase failure and phase sequence relay for three phase three wire supplies, fixed settings, one 10A changeover contact in an 18mm module.
WXU-04 Over and Under Voltage Relay 3 Phase
WXU-04 over and under voltage relay, three phase three wire, eight voltage steps 220V to 460V, threshold dials 2% to 20%, delay 0.1 to 10 seconds.
WXU-05 Phase Sequence Relay with Voltage Window
WXU-05 phase sequence relay for motor circuits, sequence and phase loss check, Un 220V to 460V in eight steps, 0.1 to 10 second delay.
WXU-06 Voltage Monitoring Relay with Asymmetry
WXU-06 voltage monitoring relay with a 5% to 15% phase asymmetry threshold, Un 220V to 460V in eight steps, threshold dials 2% to 20%, 18mm module.
WXU-07 Phase Asymmetry Relay with Delay
WXU-07 phase asymmetry relay with a 5% to 15% unbalance threshold and a 0.1 to 10 second delay, one 10A changeover contact in an 18mm DIN module.
WTS1 Loop Delay Relay AC/DC 12-240V
WTS1 Loop Delay Relay, 0.1 second to 10 day delay range, AC/DC 12-240V supply, knob setting and one 16A delay changeover contact in an 18mm module.
Send the Array Size and String Voltage
Tell us the array capacity, the number of strings, the string voltage and whether a generator backs the site. We reply within 24 hours with the parts list, the ratings matched to the design, and the packing plan.
COORDINATION
Ratings That Have to Match Each Other
The parts on a solar installation fail at the joints between them, not usually inside them. A string fuse chosen without checking the cable ampacity protects nothing; a fuse above the cable rating lets the cable burn before the fuse clears.
The DC surge device has the same problem with voltage. The rating has to cover the array open-circuit voltage at the coldest morning the site will see, because Voc rises as temperature falls. A device rated at the nominal string voltage is under-rated in winter.
The breaker and the fuse also have different jobs. Fuses protect each string against reverse current and cannot be switched. A breaker adds the isolation point, and its pole count follows the system voltage rather than the current.
Send the array layout and the string voltage, and the ratings can be checked against each other before anything is ordered.
COMMON QUESTIONS
Frequently Asked Questions
Connectors at the module leads, fuses where more than two strings are paralleled, a DC surge device at the point where the cables enter the building, and a DC breaker or isolator for service work. The array voltage decides the ratings of the surge device and the breaker.
The fuse protects the string cable against reverse current; it cannot be switched off. A DC breaker adds the isolation point that service work needs, so many combiners use fuses per string and one breaker as the isolator.
The array maximum system voltage, checked against the open-circuit voltage at the lowest expected temperature. Cold weather raises the voltage, so a device rated only at the nominal figure can be under-rated on a winter morning.
Yes, that is what a dual-power transfer switch is for. Size it on the load the generator will carry, not on the generator nameplate, and choose four-pole switching where the neutral has to be isolated with the phases.
Yes. The two sides of the inverter see different surge paths and different voltages, and an AC device will not protect a DC bus. Protection is staged on both sides of the inverter.
Yes. Logo printing and private-label cartons are handled at our plant in Liushi, Yueqing. Send the artwork and the model list, and we confirm what can be changed for each part.
CONTACT US
Start Your Electrical Project Today
Send your application, voltage, certifications and quantity to this electrical protection manufacturer. We reply with a quotation within 24 hours.
- Engineering review by an electrical protection manufacturer before quoting
- Plant pricing with no intermediaries
- Export packing and shipping handled in one place
- One order owner from quotation to delivery