JQC-3F-1C-12VDC Power Relay Small Size High Sensitivity

JQC-3F-1C 12VDC Compact Power Relay | SPDT 10A AgCdO Contacts Low-Power High-Sensitivity Electromagnetic Relay for ASIC Miner PSU and Control Board Replacement Repair

The JQC-3F-1C-12VDC Power Relay is a compact SPDT (1C form) electromagnetic relay used across ASIC miner power supplies and control boards as a switching element for power-failure logic, standby control, and load disconnect functions. Drop-in replacement when the original relay fails open, sticks closed, or shows degraded contact resistance.

Compact form factor (~15 × 10 × 14 mm typical) with low coil power consumption and high contact load capacity (10A 28VDC / 7A 240VAC) — the right balance for control board logic and intermediate-power switching. AgCdO contact material handles inductive load arcing better than pure silver contacts; ≤100MΩ contact resistance at 1A 6VDC ensures clean signal transmission for control loops. 1×10⁷ mechanical lifecycle and fast operate / release times (≤10ms / ≤5ms) support the cycling requirements of intermittent loads in production mining environments.

When to Replace the JQC-3F-1C Relay

• PSU standby logic broken — relay stuck open or closed, breaking the standby-to-main switching.
• Audible relay chatter — degraded coil or marginal supply voltage causing rapid on-off cycling.
• Contact resistance climbing — switched signal showing voltage drop or noise from worn contacts.
• Visible damage on the relay package — burn marks, melted housing, contact pitting from inductive arcing.
• Preventive board refurbishment — refresh relay alongside electrolytics during a complete control board overhaul.

JQC-3F-1C Relay Specifications

FAQ — JQC-3F-1C Power Relay

Q: What does "1C" form mean?
A: 1C is SPDT — Single Pole Double Throw. One common pole, two switched contacts (normally open + normally closed). When the coil is energised, the common pole connects to the NO contact; when de-energised, it connects to the NC. Standard form factor for general-purpose switching applications.

Q: Why AgCdO contacts vs pure silver?
A: AgCdO (silver-cadmium-oxide) handles inductive load arcing significantly better than pure silver — important when switching motor loads, transformer primaries, or other inductive loads that generate arc during contact opening. Pure silver contacts in such applications develop pits and high resistance within months.

Q: How do I diagnose relay failure?
A: With the board powered off, ohm-out the coil — should read ~100-500Ω typical for a 12V relay. Open coil = dead, replace. Then with 12V applied to the coil, listen for the audible click — no click = stuck mechanism. Probe the contacts — should read <1Ω when energised, >100MΩ when de-energised.

Q: Bulk pricing for repair shops?
A: Yes — email contact@lys-sz.com with your monthly volume. Case-quantity pricing available.

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• UC2842B PWM Controller – Bitmain / Avalon PSU
• Avalon Control Board – A1566 / A1366 / A1346 / A1446 / A1466
• STI3472 Step-Down Converter – Whatsminer Control Board

Repair shops stocking JQC-3F-1C relays by the case? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouse.