Johnson Controls M4-SNC16121-0 — Network Controller

Part number	M4-SNC16121-0
Brand	Johnson Controls
Category	Controller
Description	Network Controller
Manufacturer	Johnson Controls
Product Type	Network Controller
Product Line	M4 Controllers
Part Number	M4-SNC16121-0
Power Consumption	38 VA maximum
Operating Humidity	10% to 90% RH (30°C max dew point)
Total I/O	28 onboard points (Inputs and Outputs)
Transmission Speeds (Ethernet)	100 or 10 Mbps
Storage Humidity	5% to 95% RH (30°C max dew point)
Maximum MSTP Devices	50 devices
Non-Operating Temperature	-40°C to 70°C
Housing	Black Polycarbonate & ABS blend
Power Supply	24 VAC (North America), SELV (Europe)
Operating Temperature	0°C to 50°C
Mounting	DIN rail or flat surface with screws

The M4-SNC16121-0 is a network controller from the Johnson Controls M4 Controllers series designed to efficiently manage and control HVAC systems. This controller is versatile for varied applications, operates within a wide humidity range, and features multiple input and output points.

Compatibility data for this part number is being verified. Send an RFQ with your equipment model and serial — our suppliers confirm fitment before quoting.

Data compiled from 1 verified source. Last reviewed 2026-08-16.