Electrical Equipment Components.
Electrical Components Wholesale – Circuit Breakers, Contactors & Relays | SIYUNJO INTERNATIONAL
About This Category
Our Electrical Equipment Components line provides essential electrical parts for industrial control panels, power distribution systems, and automation equipment. All products comply with IEC and UL standards, sourced from China’s electrical manufacturing hubs in Zhejiang and Guangdong.
Wholesale electrical equipment components including miniature circuit breakers, AC contactors, solid state relays, control transformers and terminal blocks. Industrial grade. IEC and UL standards. MOQ 100 units. Factory-direct pricing.
Product Range:
| Product | Specifications | Standards | MOQ | FOB Price |
| Miniature Circuit Breaker | 1P/2P/3P/4P, 6-63A, 10kA, C/D curve | IEC 60898, UL 1077 | 200 units | $2-$8 |
| AC Contactor | 9-95A, 220V/380V coil, 3-pole + auxiliary | IEC 60947, UL 508 | 100 units | $5-$25 |
| Solid State Relay | 25-100A, 24-480VAC, DC control 3-32VDC | CE, UL | 100 units | $8-$30 |
| Control Transformer | 100-3000VA, 380V/220V to 110V/24V | IEC 61558 | 50 units | $15-$80 |
| Terminal Block Set | 12-position, 2.5-35mm2, DIN rail | IEC 60998 | 500 units | $0.50-$3 |
Key Features:
1. Miniature Circuit Breaker:
· Thermal-magnetic trip mechanism provides both overload and short-circuit protection.
· C-curve (5-10x In) for general distribution and D-curve (10-20x In) for motor starting applications.
· 10kA breaking capacity handles most residential and commercial fault conditions.
· DIN rail mounting for quick installation in distribution boards.
· Trip-free mechanism ensures the breaker cannot be held closed during a fault condition.
· Suitable for lighting circuits, socket outlets, and general power distribution.
2. AC Contactor:
· Double-break main contacts with silver alloy tips provide reliable switching and long electrical life.
· AC/DC coil operation with wide voltage range (+/-20%) ensures stable operation under varying supply conditions.
· Built-in auxiliary contact (1NO+1NC) for status feedback and control interlocking.
· Finger-safe terminals prevent accidental contact during installation and maintenance.
· Suitable for motor starting, lighting control, heating systems, and industrial automation.
3. Solid State Relay:
· Zero-crossing switching eliminates electrical noise and reduces inrush current for resistive loads.
· Random-fire switching option available for phase-angle control applications.
· LED input indicator provides visual status confirmation.
· Built-in RC snubber protects against voltage transients.
· DC control input (3-32VDC) compatible with PLC and microcontroller outputs.
· Suitable for industrial heating, lighting control, packaging machinery, and process control.
4. Control Transformer:
· Copper windings provide superior conductivity and lower operating temperature compared to aluminum alternatives.
· Double-section bobbin construction provides isolation between primary and secondary windings.
· Thermal overload protection with manual reset prevents damage from overload conditions.
· Low no-load losses (standby power <5W) for energy-efficient operation.
· Suitable for control panel power supply, PLC power, and industrial automation systems.
5. Terminal Block Set:
· Polyamide 66 housing provides excellent electrical insulation (600V rated) and chemical resistance.
· Nickel-plated copper conductor ensures reliable electrical connection with low contact resistance.
· Rising cage clamp design provides vibration-proof wire retention.
· Marking tag compatible for circuit identification.
· Suitable for industrial control panels, building electrical distribution, and automation systems.
Quality Standards
· All products comply with international standards: MCBs to IEC 60898 and UL 1077, contactors to IEC 60947-4-1 and UL 508, SSRs to CE and UL standards, transformers to IEC 61558, terminal blocks to IEC 60998.
· Products manufactured in ISO 9001:2015 and ISO 14001 certified facilities.
· Each unit undergoes 100% factory testing including dielectric strength test (2.5kV for 1 minute), insulation resistance test (>1000MOhm), and functional operation test.
· Type test reports available upon request.
Packaging & Shipping
· Standard packaging: Individual polybag with product label + master carton. MCBs packed in 12-24 pieces per box. Contactors in individual boxes, 10-20 pieces per carton. Terminal blocks in bulk packs of 100-500 pieces per bag.
· Container loading: approximately 10,000-50,000 units per 20GP depending on product size.
· Shipping: FOB Ningbo/Shanghai, CIF to major global ports.
Ordering Information
· Sample policy: 5-10 pieces per SKU at production cost.
· Volume discounts: available for quantities above 500 units.
· Mixed orders: different electrical component categories accepted to meet MOQ.
· Payment terms: 30% deposit, 70% before shipment.
· Stock items ship within 7-10 days.
· Warranty: 24 months from date of shipment.
Applications
· Electrical wholesalers, panel builders, automation integrators, MRO suppliers, and construction electrical contractors.
Looking for electrical components? Email claire@siyunjo.com for catalog and wholesale pricing.