Power-on Delay Relay WTA1
WTA1 power-on delay relay, 0.1 second to 10 day delay range, AC/DC 12-240V supply, one 16A changeover contact in an 18mm DIN rail module.
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
MC4-T MC4-Y Solar Branch Connector
MC4-T MC4-Y solar branch connector pair, one in and two out, 30A at 1000V DC or 45A at 1500V DC, tin plated copper contacts, IP67 mated, PPO body.
MC4H Solar Fuse Connector
MC4H inline solar fuse connector for 10x38mm PV fuses, 30A at 1000V DC or 45A at 1500V DC, IP67 mated, tin plated copper contacts and a crimp gland.
Current Monitoring Relay WTKA1-01
WTKA1-01 Current Monitoring Relay.
Current Monitoring Relay WTKA1-03
WTKA1-03 Current Monitoring Relay.
3 Phase Voltage Relay WTXU-03
WTXU-03 3 Phase Voltage Relay.
3 Phase Voltage Relay WTXU-05
WTXU-05 3 Phase Voltage Relay.
3 Phase Voltage Relay WTXU-07
3 Phase Voltage Relay WTXU-07.
DC Surge Protection Device SPD WTSP-D40
DC Surge Protection Device SPD WTSP-D40 for 500V to 1000V DC strings, 20kA nominal and 40kA maximum, Up 2.0kV to 5.3kV, 35mm DIN rail.
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