Rittal 3110000 SK Enclosure internal thermostat, 24 V, 48 V, 60 V, 115 V, 230 V, 1~, 24 V, 48 V, 60 V (DC), WHD: 71x71x33.5 mm content_copy

The Rittal temperature controller type SK 3110000 is an enclosure internal temperature controller used for controlling fans, heaters, and heat exchangers, as well as serving as a signal generator for monitoring internal temperatures in enclosures. The device features a bimetallic control system as the temperature-dependent element with thermal feedback, enabling stable and reliable response to temperature changes. The operating voltage covers both AC and DC ranges: 24 V to 230 V, 1~, and 24 V to 60 V (DC). The device color is RAL 7035, a gray-beige standard design that integrates well in industrial environments.

Applications
This temperature controller is primarily designed for climate control in enclosures, where maintaining a constant internal temperature is crucial for the operation of electronic and electrical components. It can activate fans when the temperature exceeds a preset value or turn on heaters when the temperature drops too low. Additionally, it functions as a signal generator to trigger warning signals or inform external systems when threshold values are exceeded.

Functions and Features in Detail
The device includes a single-pole changeover contact (transfer switch) as a switching element, suitable for controlling loads. The permissible contact load is 10 (4) A for heating applications (Class 5 – 3) AC 10 with inductive load (cos φ = 0.6), and 5 (4) A for cooling applications (Class 5 – 4) AC with the same load type. For DC voltage, the maximum power is 30 W. The switching differential is approximately 1 K ± 0.8 K, meaning the controller switches when the set temperature is reached and only returns after a difference of about 1 Kelvin. The temperature adjustment range is 5 °C to 60 °C, sufficient for most industrial applications.

Technology Explained Simply
The bimetallic controller reacts to temperature changes through mechanical deformation, which, via a feedback circuit, actuates the contact. This technology is robust and does not require external power for the sensor unit. The thermal feedback ensures the controller does not switch with every minor temperature fluctuation, providing stable switching behavior. The connection is made via a terminal block with screw terminals from the outside, speeding up installation and simplifying maintenance.

Compatibility and Accessories
The temperature controller is suitable for mounting on vertical or horizontal 35 mm mounting rails according to EN 50 022. Additionally, it can be mounted using an included adapter in TS/SE enclosure profiles or on a mounting plate. Compatible accessories include a plug-in adapter for internal temperature controllers and a mounting plate with integrated DIN rail, enabling installation in various enclosure configurations.

Mounting and Installation
Mounting is done either directly on the mounting rail or via the adapter in the enclosure profile. The terminal block is accessible from the outside, allowing wiring without removing the device. Dimensions are 71 mm (width) × 71 mm (height) × 33.5 mm (depth), supporting installation in standardized enclosure constructions.

Operational Advantages
The temperature controller provides reliable, mechanical temperature control without electronic components that may be susceptible to interference. Simple operation and clear display of the set temperature facilitate commissioning and maintenance. The combination of robust design and flexible mounting makes it a universally applicable device in industrial enclosure technology.