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Relay / Contactor Options Comparison
Load Requirement
  • External load: Spa Electric LV25-12 swimming pool LED light system
  • Switched load: 240 VAC, 25 W
  • Steady-state current estimate: 25 W / 240 VAC = 0.104 A RMS
  • Requirement: switch active and neutral using 2-pole mains-rated contacts; do not switch PE.
Shortlist

Table

OptionTypeCoilContact Form / RatingApprox. Low-Qty PriceProcurement NotesDesign Impact
Finder 22.32.0.012.4320DIN modular contactor12 VAC/DC2 NO, 25 A, 440 VAC class~A$115 inc GST each from RS AUGood Australian low-volume procurement, recognizable industrial partRequires 12 V coil drive, not current 5 V rail
Finder 22.32.0.012.4520DIN modular contactor12 VDC1 NO + 1 NC, 25 A~A$105 inc GST each from RS AUEasy RS AU procurement, but contact arrangement is not ideal for 2-pole switching because one pole is NCNot recommended for active+neutral simultaneous NO switching
Phoenix Contact 2961299DIN rail relay module12 VDCDPDT, 10 A~A$14 inc GST each from RS AUVery low cost and easy AU procurement; check exact approvals/load categoryRequires 12 V coil drive; relay module/socket style
Jaycar / Electus SY4065Plug-in relay12 VDCDPDT, 10 A at 240 VAC~A$8.05 each at qty 10 from JaycarCheapest local source; good for prototypes, weaker compliance/professional procurement storyRequires relay cradle/socket and 12 V coil drive
Omron G6B-2214P-US DC12PCB power relay12 VDCDPST-NO, 5 A, AC-rated~US$9.81 from DigiKeyReputable relay, good stock; PCB-mounted mains requires careful compliance/layoutRequires 12 V coil drive and brings mains onto PCB
Panasonic DSP2A-L2-DC5VPCB latching relay5 V dual coilDPST-NO, 5 A, 250 VAC~US$8.77 from MouserMatches existing dual-coil 5 V architecture; reputable brandBrings mains contacts onto PCB; less preferred than external contactor stage
Same Sky PRL1-5V-DC-2APCB latching relay5 V dual coilDPST-NO, 16 A, 277 VAC listed~US$4.90 from MouserCheapest 5 V latching option; good stock in search resultNeeds deeper approval/datasheet review before product use; PCB mains separation required
Omron G7L-2A-T DC12Power relay12 VDCDPST-NO, 25 A, 277 VACelement14/DigiKey class, ~US$20+ or AU supplier-dependentVery robust contact marginRequires 12 V coil drive; larger relay, may be overkill
Recommendation
For product-oriented low-volume batches of ~10 units, prefer an external DIN-rail/contact-module approach over PCB-mounted mains contacts.
User Decision
Selected relay module: Phoenix Contact 2961299 DIN rail relay module, 12 VDC coil, DPDT / 10 A class, sourced via RS Australia class distribution. This is the project relay baseline unless later superseded by compliance review.
Finder 22.32.0.012.4320 or equivalent 2-pole, 2-NO modular contactor with 12 VAC/DC coil.
Rationale:
  • Strongest compliance/procurement story among the researched options.
  • True 2-pole normally-open contactor behavior for active + neutral switching.
  • Large contact margin relative to 0.104 A steady-state load.
  • Available from RS Australia in low quantities.
Tradeoff:
  • It is expensive at roughly A$115 each and requires a 12 V coil supply/driver, so the current 5 V relay-driver section should be revised if this is selected.
Selected cost-optimized pilot / low-volume option
Phoenix Contact 2961299 DIN rail relay module, if its approvals and exact contact load category are acceptable after datasheet review.
Rationale:
  • Much cheaper at roughly A$14 each.
  • Easy low-volume AU procurement.
  • Contact rating appears far above the 25 W load.
Tradeoff:
  • Needs exact datasheet/compliance review before product release.
  • Still requires 12 V coil drive.
Jaycar/Electus plug-in relays are attractive for quick prototypes, but are weaker for a compliance-reviewed commercial spa/pool-adjacent product. PCB latching relays are cheap and can match the existing 5 V architecture, but they put mains contacts on or near the control PCB and increase layout/compliance burden.
If the Finder/Phoenix 12 V coil path is selected:
  1. Replace the current +5V relay coil output assumption with a 12 V coil supply or external 12 V coil input.
  2. Update relay driver MOSFET voltage/current ratings and flyback clamp.
  3. Update connectors and labels to RELAY_COIL_12V_SET/RESET or CONTACTOR_COIL_12V.
  4. Re-run power budget for coil current and sealed-enclosure thermal rise.
Decision Status
Phoenix Contact 2961299 selected. Remaining decision: provide the 12 V relay coil power either from an external 12 V SELV input or by revising the controller PSU architecture to add a 12 V rail.

  • Load Requirement

  • Shortlist

  • Recommendation

  • User Decision

  • Recommended baseline

  • Selected cost-optimized pilot / low-volume option

  • Not recommended as final product default

  • Required Schematic Update if Recommended Contactor is Chosen

  • Decision Status