Power injectors put power onto a network cable where the switch cannot: a single access point on a non-PoE switch, a camera at the end of a long run, a phone in a spot the closet does not reach. Splitters do the reverse, pulling power back off the cable for devices that need a separate feed. This selection covers single- and multi-port injectors and splitters across PoE standards.
Match the PoE standard and wattage to the device it will feed - power-over-Ethernet has grown through several generations, and an injector from an earlier one starves a newer device in ways that look like random reboots. Confirm the data rate the injector passes as well, since gigabit devices behind older injectors quietly downshift. Injectors suit onesie-twosie additions; once a closet feeds many powered devices, a PoE switch is the cleaner answer. COLAMCO supplies PoE injectors and splitters matched to device lists for business, government, and education networks.