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Custom Industrial Controls and Special-Function Solutions
ATC Diversified Electronics Specials are application-specific industrial controls developed for electrical, timing, monitoring, and automation requirements that fall outside standard catalog products. The collection includes previously engineered custom monitoring relays, voltage band monitors, special-function timers, power-monitoring devices, contactor modules, and application-specific power supplies.
Current Specials include the SP-0133 Under Voltage and Frequency Monitor, SP-0325 Load Resistance Dependent DC Power Supply, SP-0331A Contactor Economizing Module, SP0327A True Power Band Monitor, ST-0169 Delayed Single Shot Timer, ST-0230 Dual Output Repeat Cycle Timer, UOA-0266 Under Voltage Monitor/Relay, UOA-0414 Under Voltage Monitor Relay, VBA-1189 Voltage Band Monitor, and VBA-1191 Voltage Band Monitor.
These designs demonstrate ATC's ability to address specialized requirements involving voltage thresholds, frequency monitoring, relay logic, timing sequences, motor loading, contactor control, and custom electrical interfaces. When a standard timer, relay, monitor, or power-control product does not match the application, an existing Special may provide the required function or serve as a starting point for an engineered solution.
Why Consider an ATC Special?
Application-Specific Functions: ATC Specials address requirements that may not be available in standard catalog relays, timers, monitors, or power-control products.
Custom Voltage and Frequency Monitoring: Available Specials include undervoltage, overvoltage, voltage-band, and under-frequency monitoring functions for specific AC and DC systems.
Special Timing Sequences: The collection includes delayed single-shot and dual-output repeat-cycle timers for machinery and process applications requiring specialized timing logic.
Motor and Load Monitoring: True-power monitoring provides an alternative to current-only monitoring when mechanical motor-load changes need to be evaluated through electrical power consumption.
OEM and Retrofit Applications: Specials can support OEM machinery, industrial control panels, HVAC systems, pump systems, process equipment, conveyors, and other applications requiring a non-standard control function.
SP-0133 Under Voltage and Frequency Monitor
The SP-0133 combines undervoltage and under-frequency monitoring in one relay. It continuously monitors line voltage and frequency and can de-energize its SPDT output when either monitored value falls below the configured threshold.
Adjustable trip settings and configurable time delay allow the monitoring behavior to be matched to the application. ATC identifies generator protection, motor controls, HVAC systems, critical process equipment, and utility- or grid-supplied systems as potential applications.
SP-0325 Load Resistance Dependent DC Power Supply
The SP-0325 is a compact load-resistance-dependent DC power supply designed for applications requiring a low-current DC output from a 120 VAC supply.
ATC specifies an output-current range of approximately 0.32 mA to 2.55 mA, with output behavior dependent on the connected resistance. The unit uses four screw terminals and is intended for applications such as industrial automation, process equipment, test systems, and OEM electronic assemblies.
SP-0331A Contactor Economizing Module
The SP-0331A Contactor Economizing Module is designed to supply full voltage for contactor pull-in and then reduce the holding voltage after engagement.
Reducing the holding voltage can reduce contactor-coil heating and power consumption while maintaining the coil in its energized state. ATC identifies HVAC equipment, pumping stations, industrial automation panels, conveyor controls, and motor-control centers as potential applications.
SP0327A True Power Band Monitor
The SP0327A True Power Band Monitor evaluates motor load using true electrical power rather than motor current alone.
The device determines power consumption from line voltage, motor current, and power factor. This can provide additional resolution in applications where motor current changes only slightly between lightly loaded and heavily loaded operating conditions.
ST-0169 Delayed Single Shot Timer
The ST-0169 Delayed Single Shot Timer provides independently adjustable OFF and ON timing intervals from 0.1 to 10 seconds.
The timer provides an SPST normally open contact and an SPDT relay output, rated by ATC at 10 amps for compatible 120 VAC or 24 VDC loads. Applications include industrial automation, process sequencing, conveyors, material handling, OEM controls, and test equipment.
ST-0230 Dual Output Repeat Cycle Timer
The ST-0230 provides dual relay outputs and four adjustable timing intervals for repeating and sequential control.
The T1 through T4 timing intervals allow the controller to create staged operating sequences for repeat-cycle control, alternating loads, process timing, and sequential equipment operation. ATC specifies a 10 amp DPDT relay output at 120 VAC.
UOA-0266 Under Voltage Monitor/Relay
The UOA-0266 uses solid-state voltage sensing with a mechanical DPDT relay output. ATC specifies an adjustable drop-out range from 80 to 120 VAC, with a factory setting of 108 VAC and pick-up occurring approximately 1 to 3 percent above the drop-out point.
The unit can be used in applications such as motor-control panels, HVAC systems, pump systems, industrial automation, and electrical-distribution panels where undervoltage or related supply conditions must be monitored.
UOA-0414 Under Voltage Monitor Relay
The UOA-0414 continuously monitors supply voltage and de-energizes its relay if the voltage falls below the selected drop-out threshold. It automatically re-energizes when voltage rises to the corresponding pick-up level.
ATC specifies an adjustable pick-up range of 102 to 135 VAC with a tracking drop-out approximately 5 volts lower. The relay provides a DPDT output rated at 5 amps at 240 VAC resistive and is identified by ATC as UL and CSA approved.
VBA-1189 DC Voltage Band Monitor
The VBA-1189 Voltage Band Monitor monitors both overvoltage and undervoltage conditions in 24/28 VDC electrical systems.
Adjustable upper and lower limits allow the acceptable operating band to be matched to the application. Potential uses include DC power systems, battery-backed equipment, control panels, telecommunications equipment, and industrial process systems.
VBA-1191 AC Voltage Band Monitor
The VBA-1191 Voltage Band Monitor provides both undervoltage and overvoltage monitoring for 220 VAC systems.
When the monitored voltage moves outside the configured operating band, the DPDT output relay de-energizes. Applications include industrial control panels, HVAC systems, pumping stations, generator monitoring, and other systems requiring an adjustable AC voltage window.
Custom Voltage Monitoring and Band Monitoring
Several products in the Specials collection address application-specific voltage monitoring. Depending on the product, available functions include undervoltage monitoring, overvoltage monitoring, adjustable voltage windows, frequency monitoring, and relay response when the monitored supply moves outside selected limits.
Because each Special was developed around a specific requirement, operating voltage, trip thresholds, output contacts, delays, and enclosure styles vary by model.
Custom Industrial Timers and Relay Logic
The ST-0169 and ST-0230 demonstrate two examples of specialized timing controls available through ATC. The ST-0169 provides a delayed single-shot sequence with independent timing adjustments, while the ST-0230 provides four adjustable timing intervals and dual relay outputs for repeating sequences.
These types of designs can address machine-control sequences that are not readily handled by a standard single-function time delay relay.
When a Standard Industrial Control Does Not Fit
A standard product may not provide the exact operating voltage, trip point, delay, relay logic, output configuration, mounting arrangement, or control sequence required by an OEM or industrial application.
ATC Specials demonstrate previously engineered solutions to these types of requirements. When evaluating a Special, compare the existing design with the exact electrical and functional requirements of the new application. If the existing product does not match, ATC can evaluate whether another standard or application-specific solution is appropriate.
ATC Specials and Custom Industrial Control FAQs
What are ATC Specials?
ATC Specials are application-specific industrial controls developed for electrical, timing, monitoring, power, or automation requirements that are not fully addressed by standard catalog products.
What products are currently in the ATC Specials collection?
The current collection includes the SP-0133, SP-0325, SP-0331A, SP0327A, ST-0169, ST-0230, UOA-0266, UOA-0414, VBA-1189, and VBA-1191.
What types of custom industrial controls has ATC developed?
Current Specials include undervoltage and frequency monitors, voltage band monitors, true-power monitors, special-function timers, contactor economizing modules, and application-specific DC power supplies.
What does the SP-0133 monitor?
The SP-0133 monitors both supply voltage and frequency. Its relay can de-energize if either value falls below the configured threshold.
Can the SP-0133 trip settings be adjusted?
Yes. ATC identifies adjustable trip settings and configurable time delay as SP-0133 features.
What is the SP-0325?
The SP-0325 is a load-resistance-dependent DC power supply with a 120 VAC input and a low-current DC output that varies according to the connected resistive load.
What output-current range does the SP-0325 provide?
ATC specifies an output-current range of approximately 0.32 mA to 2.55 mA, depending on the connected load.
What does the SP-0331A Contactor Economizing Module do?
The SP-0331A applies full voltage for contactor pull-in and then reduces the holding voltage after engagement to reduce coil heating and power consumption.
What is a true power band monitor?
A true power band monitor evaluates motor loading using electrical power calculated from voltage, current, and power factor rather than relying on motor current alone.
Why use the SP0327A instead of a current monitor?
In some motor applications, current changes only slightly as mechanical load changes. The SP0327A evaluates true power using voltage, current, and power factor, which can provide additional resolution of motor load.
What does the ST-0169 Delayed Single Shot Timer do?
The ST-0169 provides independently adjustable OFF and ON timing intervals from 0.1 to 10 seconds for specialized sequencing applications.
What output contacts does the ST-0169 provide?
The ST-0169 provides an SPST normally open contact and an SPDT relay, with ATC specifying a 10 amp rating for compatible 120 VAC or 24 VDC loads.
What does the ST-0230 Dual Output Repeat Cycle Timer do?
The ST-0230 uses dual relay outputs and four adjustable timing intervals to provide repeating, staged, or sequential equipment control.
How many timing intervals does the ST-0230 provide?
The ST-0230 provides four adjustable timing intervals identified as T1, T2, T3, and T4.
What voltage range does the UOA-0266 monitor?
ATC specifies an adjustable drop-out range of 80 to 120 VAC for the UOA-0266, with a factory setting of 108 VAC.
What does the UOA-0414 Under Voltage Monitor Relay do?
The UOA-0414 de-energizes its output when supply voltage drops below the selected drop-out point and automatically re-energizes when the voltage rises to the corresponding pick-up level.
What voltage range can be set on the UOA-0414?
ATC specifies an adjustable pick-up range of 102 to 135 VAC with a tracking drop-out approximately 5 volts lower.
What does the VBA-1189 Voltage Band Monitor monitor?
The VBA-1189 monitors both undervoltage and overvoltage conditions in 24/28 VDC electrical systems using adjustable upper and lower voltage limits.
What does the VBA-1191 Voltage Band Monitor monitor?
The VBA-1191 monitors 220 VAC systems for both undervoltage and overvoltage conditions and de-energizes its DPDT output if the monitored voltage moves outside the configured band.
What is the difference between an undervoltage monitor and a voltage band monitor?
An undervoltage monitor responds when voltage falls below a selected threshold. A voltage band monitor establishes both a lower and upper limit so it can respond to either undervoltage or overvoltage conditions.
Are ATC Specials only for motor applications?
No. Applications span motor controls, HVAC systems, pump systems, industrial automation, process equipment, conveyors, power systems, OEM electronics, testing equipment, and other industrial controls.
Can an existing ATC Special be used in a new application?
Potentially, if its electrical ratings, thresholds, timing functions, outputs, mounting, and operating characteristics match the new application. The specifications for the exact Special should be reviewed before it is selected.
What if none of the existing ATC Specials matches my application?
ATC can evaluate applications where a standard catalog product or existing Special does not provide the required voltage, timing, monitoring, relay logic, output, or other control function.
What information is useful when requesting a custom industrial control?
Useful information includes supply voltage, monitored voltage or current, desired trip points, timing sequence, input signals, output-contact requirements, load characteristics, mounting constraints, environmental conditions, reset behavior, and the operating sequence the control must perform.