Johnson Controls M4-SNC16121-04 — Network Controller

Part number	M4-SNC16121-04
Brand	Johnson Controls
Category	Controller
Description	Network Controller
Manufacturer	Johnson Controls
Product Type	Network Controller
Product Line	M4 Controllers
Part Number	M4-SNC16121-04
Power Supply	24 VAC (North America), SELV (Europe)
Power Consumption	38 VA maximum
Transmission Speeds (Ethernet)	100 or 10 Mbps
Total I/O	28 onboard points (Inputs and Outputs)
Maximum MSTP Devices	50 devices
Operating Temperature	0°C to 50°C
Non-Operating Temperature	-40°C to 70°C
Operating Humidity	10% to 90% RH (30°C max dew point)
Storage Humidity	5% to 95% RH (30°C max dew point)
Housing	Black Polycarbonate & ABS blend
Mounting	DIN rail or flat surface with screws

The M4-SNC16121-04 from Johnson Controls is a network controller that manages various inputs and outputs. This device requires 24 VAC and has a maximum consumption of 38 VA. It operates efficiently within an ambient temperature range of 0°C to 50°C.

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.