CHZ02-S-112LA2 Power Relay for Whatsminer P221C P222C PSU

CHZ02-S-112LA2 Power Relay | Whatsminer P221C and P222C PSU Replacement

Ensure reliable power control for the Whatsminer P221C and P222C power supply units with the CHZ02-S-112LA2 power relay. This essential PSU component manages the AC input switching stage — driving the high-current relay that connects mains AC to the converter front-end — and a degraded relay quickly translates into PSU startup failures, intermittent shutdowns, or full PSU loss on a P221C / P222C board.

Measuring a compact 29.2 × 12.8 × 20.9mm, the relay carries a 12V coil with 4 pins in both sensitive and standard variants. Built around silver-alloy contacts for excellent conductivity and durability, with an initial contact resistance of ≤100mΩ at 6VDC, 1A, the part establishes efficient electrical connections that hold their characteristics across the relay's mechanical service life. The 16A switching capability provides headroom over the typical AC-input current of a single ASIC PSU.

Reliable Performance and Wide Compatibility — CHZ02-S-112LA2 Power Relay

• Maximum switching voltage 250VAC / 30VDC — handles the AC input switching stage on standard ASIC PSU designs.
• Maximum switching current 16A with maximum switching power 4000VA / 480W — full headroom for ASIC PSU input duty.
• Silver-alloy contacts with ≤100mΩ initial contact resistance for clean electrical performance.
• Insulation resistance ≥1000MΩ at 500VDC, dielectric strength 5000VAC between coils and 1000VAC across open contacts.
• Surge voltage 10000V (1.2/50µs) between coil and contact — solid protection against transient events.
• -40°C to +85°C ambient operating range — covers the full deployment envelope of mining-farm conditions.

Where the CHZ02-S-112LA2 Fits

This is the workhorse power relay on the Whatsminer P221C and P222C PSU boards — exactly the part that engages when the PSU receives the start command from the miner controller. When the relay degrades, the symptoms show up as a PSU that won't start, that requires multiple power cycles to come up, that drops the load mid-mining session, or that produces an audible chatter on power-up (sticky / partial contact engagement). Replacing the CHZ02-S-112LA2 with a fresh unit restores the input switching stage and brings the PSU back to spec.

CHZ02-S-112LA2 Power Relay Features

FAQ — CHZ02-S-112LA2 Power Relay

Q: How do I tell if the relay is the failed component vs another part of the PSU?
A: Three signs point to relay failure: (1) audible chatter or buzzing on power-up; (2) PSU requires multiple power cycles to start; (3) bench-tested coil drive shows correct 12V but contacts don't make. Confirm with a multimeter in continuity mode across the contacts.

Q: Sensitive vs standard coil — which one do I need?
A: Both variants share the same physical footprint and switching specs; they differ only in coil current draw. Confirm with our sales team which variant your specific P221C / P222C board uses before ordering.

Q: Can I substitute a different brand of 12V / 16A relay?
A: Pin-compatible 12V / 16A SPDT relays in the same footprint may work, but the original CHZ02-S-112LA2 is the OEM-spec part — we recommend matching it for repair work, especially on PSUs returning to production duty.

Q: Does it work on P221B / P222B as well?
A: The CHZ02-S-112LA2 is specified for P221C / P222C. Earlier B-revision boards may use a different relay — confirm before ordering.

Q: Bulk pricing available?
A: Yes — email contact@lys-sz.com for tray-quantity pricing.

Related products

• HFD4/5 DPDT Signal Relay (DIP-8)
• SLM346 Isolated Gate Driver – Whatsminer P221/P222 PSU
• OB2276CP PWM Control IC (Whatsminer P222B)
• Whatsminer C19 16A Power Socket (P21/P222 PSU)

P221C / P222C repair benches ordering CHZ02-S-112LA2 relays in volume? Email contact@lys-sz.com for bulk pricing and matched PSU repair kits. Worldwide shipping from our Shenzhen warehouse.