Siemens 6ES5458-7LC11 Relay Output Module

Engineered for SIMATIC S5 Load Switching Applications

This module switches AC and DC loads directly from the PLC backplane. It provides reliable relay outputs for the Siemens 6ES5458-7LC11 unit. You will find this relay card in the SIMATIC S5 series. Unlike transistor modules, this version handles high voltage and current loads. It supports up to eight independent relay channels for industrial control.

Technical Specifications & Physical Dimensions

We designed this relay output module for demanding switching tasks. The table below presents all verified technical specifications.

Parameter	Specification
Physical Dimensions (W x H x D)	160mm x 125mm x 50mm
Total Weight	0.65 kg (650 grams)
Relay Output Channels	8 form-A (normally open) relays
Maximum Switching Voltage	250V AC / 125V DC
Maximum Switching Current	5 Amps per channel (resistive)
Maximum Inrush Current	10 Amps for 20 milliseconds
Component Count	8 relays, 8 suppression circuits

Functional Architecture and Contact Configuration

This module connects to actuators via a 20-pin screw terminal block. It uses eight electro-mechanical relays for universal load compatibility. You can switch motors, heaters, lamps, and contactors directly. Moreover, the module includes contact suppression on each relay. These components reduce arcing and extend contact life. Consequently, the board handles inductive loads up to 75W DC reliably.

Installation and Operational Guidelines

The Siemens 6ES5458-7LC11 responds to output changes within 10 milliseconds. It provides 1500V isolation between backplane and field contacts. You must use external fuses for circuits above 5 Amps. Always connect a flyback diode across DC inductive loads. This practice prevents contact welding from voltage spikes. Furthermore, the module includes mechanical flag indicators per relay. This feature allows visual status checking without a multimeter.

Physical Characteristics and Environmental Limits

This relay module has a rugged, industrial-grade plastic housing. Its substantial 0.65 kg weight reflects the eight relay design quality. The layout follows Siemens standard S5 module specifications. Therefore, it fits securely into any SIMATIC S5 rack. The module requires one slot width for installation. In addition, it maintains stable operation between 0°C and 60°C ambient temperature. You can store this unit safely between -40°C and 85°C.