What Is the Masimo RC-4 Compatible SpO2 Patient Cable?

The Masimo RC-4 (2406) compatible SpO2 patient cable is a reusable, aftermarket cable that connects Masimo M-LNCS pulse oximetry sensors to Masimo rainbow SET devices with the red 20-pin patient cable connector. It is widely used on rainbow-platform defibrillators, handheld oximeters, and monitors. It is a compatible replacement, not an original Masimo part, and it is built to OEM fit, form, and function.

Compatible Monitor Models

This compatible cable is confirmed for use with Masimo Radical-7 and Radical (20-pin) monitors, Rad-5, Rad-5v, Rad-8, Rad-87, and Rad-97 devices including Rad-97 NIBP and Rad-97 with NomoLine capnography, Rad-57, Rad-57c, Rad-57cm, and Rad-57m oximeters, and Pronto and Pronto-7 devices, including Pronto with Next Generation SpHb. It also fits the Physio-Control Lifepak 15, the Zoll X Series, Welch Allyn 64H and 65H Series monitors, Biolight Q-series monitors, Digicare LifeWindow 9X and LifeWindow Lite LW8Vet veterinary monitors, and the Comen K12 Pro. The device must have a red Masimo rainbow SET patient cable connector.

Design and Construction

The 3.9 ft (1.2 m) cable is sized for defibrillators, transport monitors, and handheld oximeters where the device stays close to the patient. The monitor end uses the red 20-pin rainbow connector, and the sensor end accepts Masimo M-LNCS sensors. M-LNCS sensors use a different connector than standard LNCS sensors, so confirm your sensor type before ordering. The cable is reusable after cleaning according to facility protocol and ships one per bag.

When to Replace Your Masimo RC-4 Cable

Replace the cable when the device shows “SpO2 sensor off,” “no cable,” “replace cable,” or cable/sensor fault messages with a known-good M-LNCS sensor, when saturation or pleth readings drop out as the cable is moved, or when you find a cracked jacket, a loose sensor latch, or bent or corroded pins at the red connector. Cables on defibrillators and EMS equipment are coiled, stowed, and unpacked often, so inspect the strain reliefs at both ends during routine checks.

Cross Reference and Interchange Part Numbers

This compatible Masimo M-LNCS patient cable, IPR Medical SKU SA-009RB-12ML, cross-references to Masimo 2406 (RC-4) and 4481 (RC-4 EMS), Physio-Control 11171-000037, and Zoll 8000-0341. It also interchanges with Datrend MCSA009RB12ML and Unimed U704MR-87. For a shorter 1 ft cable, IPR Medical also stocks the compatible Masimo RC-1 (2405), SKU SA-009RB-03ML. For standard LNCS sensors on red-connector devices, see the compatible Masimo Red LNC-4 (2055), SKU SA-009RB-12LS.

Why Source SpO2 Cables from IPR Medical?

IPR Medical is an ISO 9001:2015-certified independent service organization that buys, sells, repairs, and stocks parts for patient monitoring and infusion equipment. We carry compatible Masimo red and gray connector cables for LNCS and M-LNCS sensors, along with Nellcor and TruSignal SpO2 accessories, for monitors, oximeters, and defibrillators in human and veterinary care. Our team can help identify each device’s SpO2 technology and connector and support your equipment with in-house repair services.

IPR Medical buys, sells, repairs, and stocks parts for Masimo rainbow SET oximeters, monitors, and defibrillators. Contact us at 855-477-8866 or cs@iprmed.com.

Trademark Notice: This is a compatible aftermarket product. It is not manufactured, sold, licensed, or endorsed by Masimo, or any other manufacturer or supplier named on this page. Masimo, LNCS, and all other brand names, model names, and part numbers shown are trademarks of their respective owners and are used on this page only to identify the equipment this product is compatible with and the OEM parts it can replace, consistent with nominative fair use. IPR Medical is an ISO 9001:2015-certified independent service organization; references to OEM equipment describe the equipment we sell, service, and support, and do not indicate any affiliation with, sponsorship by, or endorsement from its manufacturer.