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HS Series：Provides a boost for high efficiency compressors or hel ps older compressors run cooler.
E Series：Electronic Potential Relay/Start Capacitor Combination Hard Start Kit with electronic timing circuit; Backup electronic timing circuit to protect the compressor; Can be used on PSC and CSIR type compressors; Easy 2-wire installation; Electronic potential relay (EPR) technology Instant re-start; UL® Recognized; Voltage sensing
SPP Series：Relay and Hard Start Capacitor; For all PSC AVC units from 4000 thru 1 20000BTU (1/2 thru 10H.P.); Can be used on 120 thru 288VAC units.
| HS Series | E Series | SPP Series |
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3 IN 1 Hard Start Kits
 | Model | Robertshaw | H.P. | Voltage | Replacement |
| HS21 | 600-210 | 1/12 thru 1/2 | 115V | RCO210 | |
| HS41 | 600-410 | 1/4,1/3 | 115V | RCO410 | |
| HS81 | 600-810 | 1/12 thru 1/5 | 115V | RCO810 |
E Series for Electronic Potential Relay (EPR) style Hard Start Kits
 | Model | Operating Voltage (V) | Equipment Range (Hp) | Recommended Range (Hp) | Capacitor (uF) | Replacement (uF) |
| HS4E | 90-130 | 1/12 to 1 | 1/8 to 1 | 88-106 | SPP4E | |
| HS5E | 90-277 | 1/2 to 10 | 1/3 to 2 | 43-52 | SPP5E | |
| HS6E | 90-277 | 1/2 to 10 | 1/2 to 3 | 88-106 | SPP6E | |
| HS7E | 90-277 | 1/2 to 10 | 1 to 4 | 130-156 | SPP7E | |
| HS8E | 90-277 | 1/2 to 10 | 1 to 5 | 189-227 | SPP8E |
SPP Series for reliable, field proven, UL recognized PTC style Hard Start Kits
 | Model | Increased Torque | Replacement |
| HS5 | 300%(270 oz.in) | SPP5 | |
| HS6 | 500%(270 oz.in) | SPP6 | |
| HS8 | 690%(270 oz.in) | SPP8 | |
| HS7S | 600%(270 oz.in) | SPP7S |
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