| Parameter | Value |
|---|---|
| Model | EVQ-300 (Series 5) - unit nameplates: EVQ300G1DA / EVQ300E1ZE01A523 |
| Brand | ALQ - Suzhou AnLaiQiang Electronic Technology Co., Ltd |
| Poles / Contact Arrangement | Single pole · SPST-NO-DM |
| Type of Circuit | DC |
| Rated Current | 300A |
| Rated Load Voltage | DC 100V / DC 200V |
| Max. Breaking Current | 2,000A @ DC80V (1 time) |
| Electrical Life (ON:OFF = 1s:9s) | 10,000 cycles @ DC100V · 1,000 cycles @ DC200V |
| Mechanical Life | 200,000 cycles |
| Short-Circuit Withstand Current | 400A / 1200s (per spec sheet) |
| Contact Resistance (initial) | Typical 1 mΩ |
| Insulation Resistance | 100 MΩ @ DC1000V |
| Dielectric Strength / Withstand Voltage | AC 2,500 Vrms / 10mA / 1min (between open contacts · between contacts and coil) |
| Rated Control Voltage Uc | DC 12V / 24V / 48V - holding voltage ≥85% Us · drop-out voltage ≥10% Us |
| Coil Power | Starting current 2.8A · Holding power 2W |
| Auxiliary Contact | Without (standard configuration) |
| Arc Quenching | Sealed switching chamber, inert gas |
| Operating Environment | -40°C ~ +85°C · 5-95% RH |
| Weight | Approx. 930g |
| Certification | CCC · CE |
 Front and top views - sealed inert-gas switching chamber with ceramic body, coil wires and QR-coded traceability nameplate |
 Electrical life curves - EVQ-300: 10,000 cycles @150VDC/50A down to full-load duty points per the switching voltage |  Current vs time - EVQ-300: 300A continuous, 400A/20min, 600A/10s, 1,000A/1s overload capability |
| Advantage | Benefit for Your Application |
|---|---|
| ✅ 300A Switching with Strong Break Headroom | Rated 300A continuous at DC100V/200V with a one-time maximum breaking current of 2,000A @DC80V - handles inrush and fault events in battery main circuits with confidence. |
| ✅ Long Service Life | 200,000 mechanical cycles and 10,000 electrical cycles @DC100V (1,000 @DC200V, ON:OFF=1s:9s) - years of switching duty in daily charge/discharge operation. |
| ✅ Sealed Inert-Gas Arc Chamber | The switching chamber is filled with inert gas in a sealed ceramic body - the arc is cooled and quenched rapidly, contacts stay free of oxidation, and the contactor is insensitive to dust and humidity. |
| ✅ Energy-Saving Coil, 12/24/48VDC | Starting current only 2.8A and holding power just 2W across DC 12/24/48VDC coil options - minimal load on your battery management system, ideal for always-on main contactor duty in 12V/24V battery packs. |
| ✅ Rugged & Wide-Temperature | Operates from -40°C to +85°C at 5-95% RH with approx. 930g compact flange mounting (2-Φ5.8 holes) - fits battery packs, charging piles, forklifts and industrial control cabinets. |
| ✅ Certified Quality | CCC and CE certified, designed to GB/T 14048.4 / IEC 60947-4-1 - streamlines acceptance for EV, storage and industrial equipment projects. |
Typical duty points for the EVQ-300 across low- and medium-voltage DC systems.
Lithium-Ion Battery Packs Main circuit switching contactor for 12V/24V lithium-ion battery packs in vehicles and energy storage | Forklifts & Electric Vehicles Traction and hydraulic motor contactor duty on forklifts, AGVs, golf carts and small EVs | Charging & Industrial Control Charging piles, DC distribution and industrial automation panels requiring reliable 300A DC switching |
| Item | Detail |
|---|---|
| Brand / Origin | ALQ brand · Made in China (Suzhou AnLaiQiang Electronic Technology Co., Ltd) |
| Ordering Model | EVQ-300 (Series 5) - unit nameplate examples EVQ300G1DA / EVQ300E1ZE01A523; single-pole SPST-NO-DM, 300A, DC100V/200V |
| Coil Options | DC 12V / 24V / 48V - holding ≥85% Us, drop-out ≥10% Us, holding power 2W |
| Certification | CCC · CE (GB/T 14048.4 / IEC 60947-4-1) |
| MOQ | 1 pc |
| Lead Time | Typically 7-15 days (confirm with sales) |
| Payment | T/T, Trade Assurance, etc. (confirm with sales) |
| Warranty | 1 year |
Q1. What load voltage and switching life can I expect at 300A?
A: The rated load voltage is DC100V / DC200V at 300A. Electrical life is 10,000 cycles at DC100V and 1,000 cycles at DC200V (ON:OFF = 1s:9s); the one-time maximum breaking current is 2,000A @DC80V. Mechanical life is 200,000 cycles. Share your load profile for a life estimate.
Q2. Which coil voltages are available, and how much power does the coil draw?
A: DC 12V, 24V or 48V. Starting current is 2.8A and holding power is only 2W - the holding voltage is ≥85% Us and drop-out voltage ≥10% Us, so it stays closed through dips yet releases reliably on BMS command.
Q3. The listing fields show "Number of Pole: 2 / Phase: TWO" - is this a 2-pole contactor?
A: No. Per the official EVQ-300 (Series 5) parameter table and the unit nameplates, it is a single-pole DC contactor with SPST-NO-DM contact arrangement. The "2 pole / two phase" fields in the sidebar are template values from the product listing, not the contact architecture - treat it as a 1-pole 300A DC contactor.
Q4. How is the arc extinguished without position sensitivity?
A: The contacts switch inside a sealed ceramic chamber filled with inert gas, which cools and quenches the DC arc rapidly while preventing contact oxidation - no blowout magnets or external arc chutes needed.
Q5. What are the mounting and termination details?
A: Per the dimension drawing: 2-M8×1.25 power terminals A1(+)/A2(−), flange 68.3 × 80.5mm with two Φ5.8 mounting holes, overall height 72.06mm, and AWG22 leads (red "+" / black "−" coil wires; blue auxiliary switch wire where fitted). Weight is approx. 930g.
Q6. Is it suitable for harsh environments and certified?
A: Yes - operating range -40°C to +85°C at 5-95% RH, sealed inert-gas chamber insensitive to dust and humidity, with CCC and CE certification per GB/T 14048.4 / IEC 60947-4-1.
