12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type

This Bosch type 12V, 40A 5-pin relay is popular in automotive sound and security installations.
  • Bosch type 12V, 40A 5-pin relay
  • Popular in automotive sound and security installations
  • The relay features a plastic housing with mounting tab for easy installation
Part # 
Weight: 0.08 lbs.  
List Price$3.99
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Buy 10-99 $2.25
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Part # 330-073
Qty:  EA
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Product Details

12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type

This Bosch type 12V, 40A relay is widely used in car sound and automotive security installations. The relay features a plastic housing with mounting tab for easy installation. SPDT, 30/40A. 

12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type
  • BrandParts Express
  • Part Number330-073
  • UPC844632014116
  • Product Category12V Relays & Sockets
  • Unit of MeasureEA
  • Product Rating
    (76 Reviews)
  • Weight0.08 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the 12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type
in the 12V Relays & Sockets product category.


12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type
12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type is rated 4.7368 out of 5 by 76.
Rated 5 out of 5 by from Great honest sellerVery accurate description, great product, reasonable shipping cost. What more could you ask for...Thank you
Date published: 2014-12-21
Rated 5 out of 5 by from great price,fits perfecti bought this way cheaper than the dealers,fits great on my john deere tractor.
Date published: 2014-08-10
Rated 5 out of 5 by from relays look goodInstalling the relays was an easy job. I have only used them for one day and so far they are working fine. The price was the best available.
Date published: 2014-05-12
Rated 5 out of 5 by from Great product comes with bracketAfter looking at several parts stores the cheapest one I found was ten bucks. Cheapest with bracket was 20 bucks. No brainer good relay so far.
Date published: 2014-01-27
Rated 5 out of 5 by from Best value for your buckThis relay works great for powering added accessories in your car. Good quality casing and mounting tab is great.
Date published: 2013-10-29
Rated 5 out of 5 by from Power relaysordered for a custom auto application, appear to be very well made. in process of being installed, testing functions, works very well.
Date published: 2013-08-14
  • 2015-07-06T06:16CST
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Product Q&A

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who own this product or have experience with it.
If your question requires design or troubleshooting information,
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12 VDC Automotive 5-Pin Relay SPDT 30/40A Bosch Type

Hi I have a 1994 plymouth voyager will this fit and will it help stop the flickering lights when I'm pushing the sound up , thanks.

Asked by: 4everwill
If the lights are flickering due to being close to the alternators max power, then a relay will not help. You might try a stiffening cap instead.
Answered by: Chrisf
Date published: 2015-04-03

Is there a diode and resistor inline ; inside houseing.  Kh

Asked by: jd8kh
No. Just a coil and 2 sets of form C contacts.
Answered by: TomI
Date published: 2015-01-20

I am looking for a cross reference for a MAS REL40 relay . Is the relay # 330 073 the same relay ?

Asked by: Ryde On
We do not have a cross reference available for this type of thing. Please contact our tech support for more help with this question, tech@parts-express.com or 800-338-0531 x1.
Answered by: MattP
Date published: 2014-09-23

What the the numbers of the terminals - I need dual 87's

Asked by: Steebe
The numbers on this relay are 30, 85, 86, 87 and 87a.
Answered by: MattP
Date published: 2014-09-16

Coil Voltage

I'm activating this relay with 16 Volts. Is this safe or shorten the life of the coil?
Asked by: TronixH
It will shorten the coil's life a bit, but probably not much. This relay is rated for automotive use, and a car's electrical system runs at about 14V when the car is running and the alternator is charging the battery, so 16V isn't too much more than that. How much it will shorten the coil's life is hard to say.Something you could do is put a resistor in series with the coil, to drop the voltage that appears across the coil to 12V. As I mentioned in my review of this relay, the coil's resistance is 90 ohms, so if you want to drop from 16V to 12V (that is, if you want the resistor to drop 4V), then use a resistor of 30 ohms. However, 30 ohm resistors aren't always available, so something close would work: 27 or 33 ohms would be fine (you don't need to be very precise here). As for the resistor's power rating, it will consume about 0.5W, so make sure it is rated for at LEAST that much power (standard resistors are only rated for 0.25W).
Answered by: eboyer
Date published: 2014-09-18

How many Amps to opeate the relay?

I want to know the amps needed to actuate the circuit (NO to NC), not the capacity of the relay.
Asked by: kallad
Most Bosche style relays require only 500mA to energize the coil. I've used them frequently to take the amp turn on wire from a car radio and then turn on numerous devices (amps, crossovers, EQs Neon, fans, motorization etc...). Also used them to take a low current 12V source and power fog lights, air horns etc...)
Answered by: Invisible Audio
Date published: 2014-09-16
  • 2015-07-06T07:32CST
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