SupcoHVAC Equipment

Supco Starter SPP 8

Supco Starter SPP 8 is a 3-wire mechanical potential relay hard start device for HVAC systems, featuring voltage sensing and instant restart capability with 35 Amp relay contacts for compressor protection and…

SKU 3G-CBM-01271

Also listed as: COP 04005 · COP-04005

Brand

Supco

Item

Starter SPP 8

Local availability & support — Singapore

Local office: 20 Woodlands Link #09-05, Singapore 738733
Phone: +65 8878 8355
Delivery: Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment: Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to: Singapore

Technical Specifications

Supco

type

3-wire mechanical potential relay hard start 

features

voltage sensing, instant restart 

relay contacts

35 Amp 

Datasheet Content

®




                                                                 3 Series
            Three Wire Mechanical Potential Relay Hard Starts
               For Professionals who prefer OEM-Style 3- Wire Installation
  The 3 Series Hard Starts provide the service professional
with an OEM option when the application calls for a hard start.
      Combining a potential relay and start capacitor the
          3 Series provides a True 3-Wire solution.
Benefits
• Voltage Sensing
• Instant Re-start
• 35 Amp Relay Contacts
• Quick Installation with EZ Snap Bracket
• 2 Year Warranty
                                                                      EZ Snap
Applications                                                          Bracket
• All 208/ 240 V Single Phase Compressors
• Scroll compressors
• Reciprocating compressors
• Can be used with Single or Dual Run Capacitors

 PART NO.   APPLICATION       VOLTAGE      CAPACITOR (330 V)   REPLACES 5-2-1
 3W1           1 – 3 hp     208/ 240 VAC      88 – 108 uF          CSRU1
 3W2         3.5 – 4.5 hp   208/ 240 VAC     189 – 227 uF          CSRU2
                                                                                ®
 3W3           4 – 5 hp     208/ 240 VAC     270 – 324 uF          CSRU3


                            Installation Diagram
                                                                                                           ®




CHOOSE SUPCO for ALL of your Hard Start needs:
SPP Series for reliable, field proven, UL recognized PTC style Hard Start Kits
• Economic
• Easy 2-wire Installation
  PART                                         TORQUE
  NO.          VOLTAGE            APPLICATION INCREASE
  SPP5         90 – 277 VAC       1/2 to 10 hp 300%                                       ®
  SPP6         90 – 277 VAC       1/2 to 10 hp    500%
  SPP7S        90 – 277 VAC       1/2 to 10 hp    600%


“E” Class for Electronic Potential Relay (EPR) style Hard Start Kits
• Voltage Sensing
• Instant Re-start
• Easy 2-wire Installation

  PART                                         CAPACITOR
  NO.           VOLTAGE            APPLICATION SIZE (µF)                                 ®
  SPP5E         170 – 277 VAC      1/3 to 2 hp 43 to 52
  SPP6E         170 – 277 VAC      1/2 to 3 hp 88 to 106
  SPP8E         170 – 277 VAC      1 to 10 hp  189 to 227


ULTRASTART 2-wire Mechanical Potential Relay Hard Starts
• OEM Approved Technology           • Easy 2-wire installation
• Voltage Sensing                   • 2 Year Warranty
• Instant Re-start

 PART NO.       APPLICATION          CAPACITOR SIZE              REPLACES
                                                                                         ®
 MPR5           1 to 3 hp            189-277µF; 330V             Kickstart® TO-5
 MPR1           3.5 to 5 hp          270-324 µF; 330V            Kickstart® KS-1
 MPR8           1 to 3 hp            108-130 µF; 330V            Kickstart® KS-8
 MPRM1          Maneurop             233-280 µF; 250V            Kickstart® MP-1

                                    SEALED UNIT PARTS CO., INC.
                                    PO Box 21, 2230 Landmark Place, Allenwood, NJ USA
                       Phone: 732-223-6644 • Fax: 732-223-1617 • www.supco.com • info@supco.com   F441-11082010

Technical Documents

(1)

Technical Document 1

PDF Document

Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.

Talk to an engineer

Ask a question

Supco Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

Frequently Asked Questions

What is the Supco Starter SPP 8 used for?

The Supco Starter SPP 8 is a 3-wire mechanical potential relay hard start device used in HVAC systems to provide voltage sensing and instant restart capability. It protects compressors by delivering 35 Amp relay contacts for efficient startup, and is suitable for 208/240 V single-phase scroll and reciprocating compressors.

What are the specifications of the Supco Starter SPP 8?

The Supco Starter SPP 8 is a 3-wire mechanical potential relay hard start with voltage sensing and instant restart. It features 35 Amp relay contacts and is designed for 208/240 VAC single-phase compressors. The device includes a start capacitor and an EZ Snap bracket for quick installation, backed by a 2-year warranty.

Where to buy the Supco Starter SPP 8 in Singapore?

You can source the Supco Starter SPP 8 in Singapore through 3G Electric, an industrial equipment supplier. We handle logistics, customs clearance, and delivery to your location. Contact us for pricing and lead time on this HVAC hard start device.

How to install the Supco Starter SPP 8?

Install the Supco Starter SPP 8 by following the 3-wire OEM-style diagram provided by Supco. Connect the potential relay and start capacitor to the compressor circuit, ensuring voltage sensing and instant restart. Use the EZ Snap bracket for secure mounting. Always disconnect power before installation and verify compatibility with your compressor.

Used in

Common applications for Supco

Commercial refrigeration display cases — Supco RO82 relay and CSS-25U starter for compressor motor control without run capacitors

Medium-load HVAC systems — Supco SPP 6/SPP 8 hard-start devices to reduce compressor inrush current and extend motor lifespan

Cold-chain pharmaceutical and food storage — SL300TH temperature–humidity data logger for continuous monitoring and regulatory documentation

Refrigerant service operations — Piercing valves and perforator cocks in 1/2" and 5/8" sizes for fast, non-invasive line access

Compressor thermal management — Universal Compressor Door for reducing shell temperature and improving efficiency in hot ambient conditions

Retrofit and field repairs — Supco controls with Quick Connect terminals for rapid installation in legacy refrigeration circuits

Supco Products

3G Electric supplies Supco hvac equipment. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

Browse all Supco products →Contact our engineers →