Siemens 6ES5456-4UB12 Output Module | 16 Ch, 2A, 24-240V AC

This output module provides sixteen switching channels for AC loads. The Siemens 6ES5456-4UB12 belongs to the SIMATIC S5 product family. You can connect solenoids, contactors, and pilot lights directly. Its robust design handles demanding industrial switching applications reliably.

Physical Dimensions and Hardware Layout

The Siemens 6ES5456-4UB12 measures 25.0 cm in overall width. Its total depth reaches 21.5 cm including the connector hood. This output module weighs approximately 0.85 kg. A metal housing provides excellent shielding against electrical noise. One green LED indicates backplane power status. Additionally, sixteen red LEDs show each channel’s active switching state.

Output Specifications and Load Handling

Each output channel switches 24V AC loads up to 2.0A continuously. The Siemens 6ES5456-4UB12 provides a total module current of 8A maximum. Built‑in snubber circuits protect against inductive load spikes. The module also features fuse protection on each output channel. Outputs require replacement fuses after overcurrent events.

Parameter	Specification
Number of Channels	16
Output Type	Triac (AC switching)
Load Voltage Range	24 to 240V AC
Output Current per Channel	2.0A continuous
Total Module Current	8A max
Surge Current	10A for 20 ms
Off‑State Leakage	< 1.5 mA
Switching Speed (On)	1.0 ms typical
Switching Speed (Off)	10.0 ms typical
Dimensions (W x H x D)	250 mm x 75 mm x 215 mm
Weight	0.85 kg (1.87 lbs)
Terminal Type	Screw block (removable)
Wire Size	0.5 to 2.5 mm²
Number of Terminal Screws	32
Backplane Current Draw	300 mA @ 5V DC
Power Dissipation	6.0 W max at full load
Internal Energy Storage	220 µF capacitor bank
Protection Features	Fuse (2A per channel) + snubber
Fuse Type	5×20 mm, 2A slow-blow
LED Indicators	1 green (power), 16 red (channels)
Operating Temperature	0°C to +60°C

Energy Storage and Output Behavior

Internal capacitors maintain control logic during brief power dips. The Siemens 6ES5456-4UB12 stores enough energy for 15 ms of hold‑up time. This storage prevents false output resets during short interruptions. All outputs de‑energize safely after a power failure longer than 15 ms.

Protection Circuits and Maintenance Features

Each output channel includes a replaceable 2A slow‑blow fuse. Built‑in snubber circuits (47 Ω + 0.1 µF) reduce voltage spikes. The Siemens 6ES5456-4UB12 also provides optical isolation for each channel. This isolation protects the backplane from field wiring faults. Replace fuses only when the module is power‑off.

Wiring and Installation Guidelines

Connect AC loads to the removable screw terminal block. The Siemens 6ES5456-4UB12 accepts solid or stranded wires from 0.5 to 2.5 mm². Use a common AC supply for all output loads. Proper grounding reduces electrical noise significantly. Therefore, system reliability improves in industrial environments.