ABB 1SVR730180R0300 CT-APS.21S Electronic Time Relay OFF-Delay 24-240V AC/DC

The ABB 1SVR730180R0300 is an electronic time relay from the ABB CT-S range,
identified by the extended product type CT-APS.21S. It is designed to provide
a dedicated OFF-delay timing function for industrial control and automation circuits. The relay
operates with a wide rated control supply voltage of 24-240 V AC/DC and provides two changeover
output contacts.

The CT-APS.21S is particularly suitable for applications where an electrical circuit must remain
energized for a defined period after the initiating signal has been removed. Its OFF-delay function
provides controlled timing without requiring a programmable controller for simple timing operations.
The device offers ten selectable time ranges covering periods from 0.05 seconds to 300 hours.

ABB 1SVR730180R0300 Product Overview

ABB 1SVR730180R0300 belongs to the CT-S family of electronic timers and control relays. The CT-S
range is intended for industrial automation, control panels, machine control and general timing
applications where reliable time-dependent switching is required.

The CT-APS.21S is a single-function time relay. Its dedicated operating function is OFF-delay,
also commonly described as delay-on-break. In this operating mode, the output contacts change
state when the control signal is removed and remain in the timed condition for the selected delay
period before returning to their normal state.

This operating principle makes the relay useful in control circuits where equipment or auxiliary
components need to continue operating for a predetermined period after a control signal has been
switched off.

Technical Specifications

OFF-Delay Timing Function

The main function of the ABB 1SVR730180R0300 is OFF-delay timing. In a conventional control
sequence, an output may immediately return to its normal state when a control signal is removed.
An OFF-delay relay introduces a defined time interval between the removal of the control signal
and the final change of the output contacts.

This function can be used when a motor auxiliary circuit, cooling fan, ventilation device, lighting
circuit or other control component needs to remain active for a specified period after the primary
equipment has been switched off.

Because the CT-APS.21S provides ten timing ranges from 0.05 seconds through 300 hours, it can cover
both very short control sequences and substantially longer delayed switching operations. The exact
setting is selected according to the requirements of the application.

Wide Control Supply Voltage

One of the important characteristics of ABB 1SVR730180R0300 is its wide control supply range.
The relay accepts 24-240 V AC/DC, allowing the same product configuration to be incorporated into
control systems using different common control voltages.

The wide supply range can simplify equipment design because a separate timer model does not
necessarily have to be selected for every control voltage within the specified range. Nevertheless,
the actual supply voltage should always be checked against the permitted input range before
installation.

Two Changeover Output Contacts

The CT-APS.21S provides two changeover contacts, also described as 2 c/o or two SPDT outputs.
A changeover contact provides both normally open and normally closed contact paths, allowing the
timing relay to control different types of downstream circuits.

The two output contacts can provide additional flexibility when a timing signal needs to be
distributed to more than one control circuit. The contacts are electrically isolated from the
electronic timing function according to the relay’s specified configuration and ratings.

ABB specifies the output contacts with a rated contact voltage of up to 250 V and a contact
current rating of up to 4 A under the applicable conditions. The actual switching load should
always be evaluated against the appropriate utilization category and electrical characteristics.

DIN Rail Installation

ABB 1SVR730180R0300 is designed for DIN rail mounting, making it suitable for installation in
industrial control cabinets and electrical distribution enclosures. Its 22.5 mm product width
allows it to occupy a relatively narrow position on a standard DIN rail.

The product dimensions are approximately 22.5 mm wide, 85.6 mm high and 103.7 mm deep. These
dimensions should be considered when planning cabinet space, wiring routes and the positioning
of adjacent control devices.

The relay uses screw connection technology with double-chamber cage terminals. This provides a
conventional wiring interface for control panel applications and allows the device to be connected
using appropriate conductors according to the installation requirements.

Typical Applications

• Industrial automation control panels
• Machine control systems
• Motor control circuits
• Cooling fan delayed shutdown
• Ventilation control systems
• Lighting control circuits
• Delayed switching of auxiliary equipment
• Electrical control cabinets
• General industrial timing applications
• Control circuit sequencing

Application Advantages

The ABB 1SVR730180R0300 combines a simple single-function operating concept with a broad timing
adjustment range. This makes it suitable for applications that require an OFF-delay function but
do not require the complexity of a programmable automation controller.

The wide 24-240 V AC/DC supply range is another useful characteristic for industrial control
applications. It permits the relay to operate in control systems using a variety of commonly
encountered AC and DC supply voltages within the specified range.

The two changeover outputs further expand its application flexibility. They can be incorporated
into control circuits where both normally open and normally closed switching paths are required.
Combined with DIN rail mounting and screw terminals, these characteristics make the CT-APS.21S
suitable for conventional industrial control cabinet construction.

Product Identification and Selection

When identifying this ABB time relay, the complete product number should be checked together with
the extended product type. The ABB ordering code 1SVR730180R0300 corresponds to
CT-APS.21S.

Similar products in the CT-S family can have different ABB ordering codes while providing different
timing functions, output configurations or supply voltage combinations. Therefore, the exact
product number should be verified before selecting a replacement or integrating the device into
an existing control system.

Conclusion

The ABB 1SVR730180R0300, also known as the CT-APS.21S, is an
electronic OFF-delay time relay from ABB’s CT-S series. It provides ten selectable timing ranges
from 0.05 seconds to 300 hours, operates with a 24-240 V AC/DC control supply and provides two
changeover output contacts.

Its DIN rail mounting, compact 22.5 mm width, screw terminals and flexible timing range make it
suitable for industrial automation, machine control and general electrical timing applications.
When specifying the device, the ABB product number, timing function, control supply, output
configuration and required delay range should be verified to ensure compatibility with the
intended control system.