Furnas 42BF35AF Definite Purpose Contactor | Replacement, Equivalent & Selection Guide
The Furnas 42BF35AF is a Definite Purpose (DP) contactor designed for reliable switching in HVAC, refrigeration, and light commercial motor-control applications. This page provides full technical specifications, verified replacement options, system compatibility data, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Furnas (Siemens) |
| Part Number | 42BF35AF |
| Type | Definite Purpose Contactor |
| Poles | 2-Pole |
| Coil Voltage | 24V AC / 60 Hz |
| Continuous Current Rating | 30 A |
| HP Rating (Single Phase, 240V) | 3 HP |
| HP Rating (Three Phase, 240V) | 7.5 HP |
| Auxiliary Contacts | 1 NO |
| Enclosure | Open / Panel Mount |
| Mounting | DIN Rail / Screw |
| Weight | 268 g |
| Standards | UL Listed, CSA Certified |
Note: Always verify specifications against the official Siemens/Furnas datasheet before final selection.
Compatible Replacement & Equivalent Models
The following models are widely accepted as direct or near-direct replacements for the Furnas 42BF35AF. Verify coil voltage, pole count, and current rating before substitution.
| Brand | Model | Poles | Coil Voltage | Current | Notes |
|---|---|---|---|---|---|
| Siemens | 42BF35AF | 2P | 24V AC | 30 A | OEM equivalent (Furnas rebranded) |
| Schneider Electric | 8910DPA32V02 | 2P | 24V AC | 30 A | Direct replacement, same footprint |
| Eaton / Cutler-Hammer | C25BNB230A | 2P | 24V AC | 30 A | Compatible; verify terminal layout |
| Honeywell | DP2030A5004 | 2P | 24V AC | 30 A | HVAC-grade equivalent |
| White-Rodgers | 90-290Q | 2P | 24V AC | 30 A | Common HVAC aftermarket replacement |
| Mars | 61701 | 2P | 24V AC | 30 A | Economy replacement option |
⚠ Disclaimer: Cross-reference data is provided for reference only. Konmask.com recommends confirming compatibility with your system engineer or OEM documentation prior to installation.
Why Choose the Original Model
- OEM Assurance: The Furnas 42BF35AF is manufactured to Siemens quality standards, ensuring consistent performance across production batches.
- Proven Field Reliability: Widely deployed in North American HVAC and refrigeration systems with a long service history.
- UL/CSA Certification: Meets North American safety standards required for commercial and industrial installations.
- Warranty Compliance: Using the original part preserves OEM equipment warranties that may be voided by aftermarket substitutions.
- Exact Fit: No modification required — direct drop-in for existing Furnas/Siemens panel designs.
Typical Applications
- HVAC compressor and condenser fan motor control
- Commercial refrigeration units and walk-in coolers
- Light commercial air conditioning systems
- Pump and fan motor switching in building automation
- Resistance heating element control
- OEM equipment panels requiring UL-listed contactors
System Compatibility
The 42BF35AF is compatible with standard 24V AC control circuits commonly found in:
- Carrier, Trane, Lennox, York, and Rheem HVAC systems
- Copeland and Tecumseh compressor assemblies
- Building Management Systems (BMS) using 24V AC relay outputs
- Thermostat-controlled single-phase and three-phase motor loads up to rated HP
Ensure the control transformer output matches the 24V AC coil requirement. Do not apply DC voltage to the coil.
Selection Guide
Use the following criteria to confirm the 42BF35AF is the correct contactor for your application:
| Selection Criterion | Required Value | 42BF35AF Rating | Match? |
|---|---|---|---|
| Number of Poles | 2-Pole | 2-Pole | ✅ |
| Coil Voltage | 24V AC, 60 Hz | 24V AC, 60 Hz | ✅ |
| Load Current | ≤ 30 A | 30 A continuous | ✅ |
| Motor HP (1Ø, 240V) | ≤ 3 HP | 3 HP | ✅ |
| Motor HP (3Ø, 240V) | ≤ 7.5 HP | 7.5 HP | ✅ |
| Auxiliary Contact | 1 NO required | 1 NO | ✅ |
| Certification | UL / CSA | UL Listed, CSA | ✅ |
If your application requires a different coil voltage (e.g., 120V AC, 208V AC, or 240V AC), refer to the Furnas 42BF series for alternative coil voltage variants.
Quality Assurance & Sourcing
- Authorized Distribution: Konmask.com sources Furnas/Siemens contactors through verified industrial distribution channels.
- Inspection: Each unit undergoes visual and functional pre-shipment inspection.
- Packaging: Ships in original OEM or protective anti-static packaging to prevent transit damage.
- Traceability: Batch and lot documentation available upon request for MRO and OEM procurement teams.
- Lead Time: In-stock units ship within 1–3 business days. Contact us for volume pricing and expedited options.
How to Order
- Confirm your coil voltage, pole count, and current rating match the 42BF35AF specifications above.
- Add the item to your cart or contact us directly for bulk/OEM pricing.
- Provide your shipping address and preferred freight method at checkout.
- For purchase orders (PO), email support@konmask.com with your PO document.
- Track your shipment via the confirmation email sent after dispatch.
Need a custom quantity, expedited shipping, or a formal quotation? Contact our team directly.
Replacement & Compatibility FAQ
Q: Is the Furnas 42BF35AF the same as the Siemens 42BF35AF?
A: Yes. Furnas is a legacy brand fully absorbed into Siemens. The part numbers are identical and the products are manufactured to the same specification.
Q: Can I replace the 42BF35AF with a Schneider 8910DPA32V02?
A: In most cases, yes — both are 2-pole, 30A, 24V AC contactors. Verify terminal spacing and mounting dimensions match your panel before installation.
Q: What happens if I use a higher-rated contactor as a replacement?
A: A higher current-rated contactor (e.g., 40A) will function electrically, but may not fit the original mounting footprint. Always verify physical dimensions.
Q: Can the 42BF35AF be used with a 50 Hz power supply?
A: The coil is rated for 60 Hz. Operation at 50 Hz may cause overheating of the coil. Contact Siemens or Konmask.com for 50 Hz-rated alternatives.
Q: Do you provide a warranty on this product?
A: Yes. Konmask.com provides a standard warranty against manufacturing defects. Contact support for warranty terms applicable to your order.
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