PSP Products, Inc. | 8618 Phoenix Drive | Manassas, VA 20110 | pspproducts.com | 1-800-648-6802 | [email protected]
Revised: 9/23/2021
The SAK-60 is a 60 amp microprocessor controlled two-pole latching relay with built in functionality to
lock out or manage loads on generator power, protect from over-voltage / under-voltage and brownouts.
The SAK-60 can also work as conventional relay with dry contact inputs with adjustable on-time delay. The
device is built around latching relays that are toggled on and off by a short pulse of energy to open and close
the contacts. The relay incorporates SRT
®
(Smart Relay Technology) to control switching at the zero cross
over point of the sine-wave for reliability and maximum life expectancy of the contacts. The SAK-60 is self-
powered by the 120 VAC or 120/240 VAC line input voltage eliminating the need for a secondary power source
normally required to power the coil of a conventional device. Additionally, the SAK-60 comes with a two year
product warranty from the date of install.
Generator Detection & Load Lock-Out
The SAK-60 uses a proprietary Sine Wave-Distortion Index
®
with user adjustable sampling rates to adapt
to most utility and generator sine-waves. When Load-Drop is selected from the main menu Mode “B 0000”,
at power the device will turn the relay off at power up. The system analyzes the sine-wave to determine if
the power source is utility or generator. When utility is detected, the Gen-Util LED will turn green, the Load
On relay LED will illuminate yellow, closing the relay contacts and restoring the connected load. When
generator is detected, the Gen-Util LED will illuminate red, and the load will remain off until stable utility
power is restored. The Sine Wave Distortion Index
®
reading will be displayed on the LCD digital display. After
utility power returns and is detected by the SAK-60, The Gen-Utility LED will turn green, the Load On LED
illuminates yellow and the device enters sleep mode.
Generator Detection & Load Management With Under Frequency Control
In addition to Load-Lockout, the SAK-60 can Load-Manage using Under Frequency detection for air cooled
generators. There are two modes for under frequency load management. The first Mode “C 0001” is fixed
and the pre-set under frequency and delay times cannot be adjusted. These values should be suitable for
most air-cooled applications. The second Mode “C 0000” provides field adjustments for frequency and delay
time to allow the installer to adjust up to three levels of under frequency detection. The option to adjust these
parameters allows the SAK-60 to adapt to the majority of load management applications
Load Management Under Frequency Control
When power is restored after a power outage, and load management Mode “B 0001” is selected, the SAK-
60 disconnects the load. The system analyzes the sine-wave to determine if the power source is utility or
generator. When a utility sine wave is detected, the Gen-Util LED turns green, the Load On LED illuminates
closing the relay contacts to restore the connected load. The SAK-60 will now enter sleep mode. When
generator sine-wave is detected, the Gen-Util LED illuminates Red indicating generator power is detected.
After the adjustable delay “g 000.0”, the load is restored and the Gen-Util LED flashes red, indicating load
management mode is active, and the yellow LED illuminates indicating the load is restored. The AC frequency
is displayed on the front panel LCD. In the event of an under frequency condition meeting the trigger points of
either Mode “C 0001” or “C 0000”, the load is disconnected for the delay time set in Mode “O 000.0”. When
utility power is restored, the Gen-Util LED will illuminate green and device enters sleep mode.
Conventional Relay with Dry-Contact Control Input
The SAK-60 can work as a stand alone 60 amp relay, controlled by a normally open or normally closed logic
dry contact control input.
Do not apply voltage to the dry contact terminals. This will damage the SAK-60
and void the warranty.
The loads controlled by the relay can be either 120/240 VAC double pole or 120 VAC
single pole. Relay control can be adjusted for instant closure of the contacts, or for delayed closure for up to
10 minutes in one second increments. This device is also designed to be used as a standalone over-voltage /
under-voltage protection cut off device with adjustable High/Low set points and restore delay adjustments.
Technical Assistance Call: 800-648-6802
Instructional Videos available at: www.sak60.com
SAK-60
Installation and Programming Instructions
