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Voltage Switches & Relays |
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The Relay Driver is a logic module which provides control functions such
as high/low voltage alarms, load control and generator start for 12, 24 or
48 volt battery systems. It controls four independent relay driver outputs
by reading digital data inputs from Morningstar’s TriStar controller or by
reading battery voltage. Outputs can be used to operate any of the relays in
the next column or any other mechanical or solid
state relay with a coil voltage that is the sames a the battery voltage
power the relay driver. Maximun current for each output channel is 750 mA.
The Relay Driver may be mounted to a DIN rail and is fully programmable with the included PC software via serial RS-232 port connection. Dimensions are 6.4" x 3.2" x 1.3" and weight is 0.4 lb. Terminals can accept 16 to 24 AWG wire. Self consumption is less than 20 mA and the unit will operate from 8 to 68 volts DC.
3 year warranty
These are user adjustable voltage activated relays with SPDT (single pole, double throw) contacts rated for 30 amps. The relay coil in the “Active-High” version is powered when the voltage rises to the high set-point. The relay in the “Active-Low” is powered when voltage drops to the low set-point. The SPDT relay allows the voltage controlled switch to either connect or disconnect a circuit when it operates or to turn one thing on while turning another thing off.
Voltage settings are user-adjustable and can be read with a voltmeter. An active high relay can be used as a DC pump controller, a diversion load controller, or to operate a large relay for a high-powered charge controller. An active low can be used as a 2-wire generator start controller or as a low battery voltage load disconnect.
These devices consume 17mA when off. Maximum switched current is 30A at 12/24 VDC, 3A at 48 VDC. VCS-1 measures approx. 3" x 5.3" x 1.75". VCS-2 comes in a 5" x 7" x 2" enclosure.
1-year warranty.
| Model |
Mode of operation |
Enclosure | SKU | Price | Purchase |
| VCS-1AH | Active High | No | 020-06218 | $112 |
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| VCS-2AH | Active High | Yes | 020-06215 | $180 |
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| VCS-1AL | Active Low | No | 020-06221 | $112 |
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| VCS-2AL | Active Low | Yes | 020-06224 | $180 |
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These single pole, double throw 40-amp enclosed relays are widely used in the automotive industry. Wires may be attached with 1/4" quick-connect terminals or the relay socket below may be used. Nominal operating current is 140mA. Relay socket has 2 feet of wire.
| Description | Coil current | SKU | Price | Purchase |
| 40 A SPDT 12V relay | 140 mA | 053-08290 | $16 |
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| Relay socket for 40 A relay | 053-08291 | $10 |
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This enclosed single-pole, single-throw relay has one set of contacts that close when power is applied to the coil terminals. It can be used to turn on 12-volt loads of up to 75 amps.
Power terminals are 10-32 screws and coil terminals are ¼" quick disconnects. 300mA is nominal operating current.
| Description | Coil current | SKU | Price | Purchase |
| 75 A SPST relay | 300 mA | 053-08293 | $30 |
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These double-pole, double-throw relays can be used for up to 30 amps at 12 or 24 volts DC or 120/240 volts AC. All contact surfaces are silver alloy with gold flashing. Contact terminals are #8-32 screws and coil terminals are #6-32 screws. Relays with 120 VAC or 240 VAC coils can be used to build simple transfer switches.
Relays with DC coils can be used for remote operation of pumps and fans. By connecting a relay with a DC coil to a voltage controlled switch, AC or DC loads may be turned on or off based on battery voltage levels.
| Description | Coil current | SKU | Price | Purchase |
| DPDT 30A relay – 12VDC coil | 170 mA | 053-08281 | $48 |
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| DPDT 30A relay – 24VDC coil | 53 mA | 053-08287 | $48 |
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| DPDT 30A relay – 120VAC coil | 83 mA | 053-08278 | $48 |
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| DPDT 30A relay – 240VAC coil | 42 mA | 053-08284 | $55 |
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This relay is designed to isolate a second battery in a vehicle. The contact terminals are connected between the positive terminal of the starting battery and the positive terminal of the second battery. The negative terminals of both batteries are connected to the vehicle chassis.
One of the coil terminals is connected to
chassis ground and the other coil terminal is connected to the
ignition switch or fuse box. When the vehicle is running, both
batteries are connected together in parallel and being charged by
the alternator. When the ignition switch is off, the contacts are
open, disconnecting the second battery from the vehicle electrical
system. 80-amp maximum continuous current. 12-volt coil.
| Description | SKU | Price | Purchase |
| Dual battery isolator relay | 053-08272 | $28 |
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This page last up-dated on September 10, 2009