

⚡ Heavy-Duty Power Meets Marine-Grade Durability – Don’t Get Left Behind!
The MaySpare Max Transient 200A Trombetta 12V Solenoid Relay is a heavy-duty, 3-terminal SPST solenoid designed for starter and winch applications. Featuring a robust 200 amp current rating, copper contacts, and a corrosion-resistant plated steel housing, it ensures reliable performance in marine and automotive environments. Its sealed design protects against the elements, while the flat base and 180° mounting bracket simplify installation. Ideal for transient duty with a recommended 5-minute hold time to avoid overheating.




| ASIN | B0797WZBD9 |
| Amperage | 200 Amps |
| Best Sellers Rank | #4,648 in Automotive ( See Top 100 in Automotive ) #1 in Automotive Replacement Starter Solenoids |
| Brand | MaySpare |
| Coil Voltage | 12 Volts |
| Connector Type | Screw |
| Contact Current Rating | 200 Amps |
| Contact Material | Copper |
| Contact Type | Normally Open |
| Current Rating | 200 Amps |
| Customer Reviews | 4.3 4.3 out of 5 stars (2,803) |
| Date First Available | January 23, 2018 |
| Exterior | Metallic Finish |
| Is Discontinued By Manufacturer | No |
| Item Weight | 12.7 ounces |
| Item model number | US-AUTO3T |
| Manufacturer | May Spare Parts |
| Manufacturer Part Number | US-AUTO3T |
| Maximum Switching Current | 5 Amps |
| Maximum Switching Voltage | 12 Volts |
| Minimum Switching Voltage | 12 Volts (DC) |
| Mounting Type | Pole |
| Number of Terminals | 3 |
| OEM Part Number | 1114240 ,1114241,1114538 ,97240-X , 70091714, 974-1215-10-16 ,934-1215-010-16 ,934121501016, 934-1215-010 ,9341215010 |
| Operation Mode | Automatic |
| Package Dimensions | 3.62 x 3.05 x 3.03 inches |
| Specification Met | OEM |
| UPC | 729043161300 |
| Voltage | 12 Volts |
| Wattage | 10.28 watts |
M**1
Working great on my Exmark.
Installed this on an Exmark with a Briggs & Stratton engine. Working great but the mounting holes in the feet seem too close under the bigger cables. It was a bit tight to tighten the nuts.
M**I
Exactly as described, good quality and great price.
Exactly as described, good quality and great price.
B**G
12 volt starting solenoid
Exactly as described, good replacement starting solenoid
M**K
ground the other small wire
worked as it should,the two small wires one is what i call the trigger wire and the other Must be grounded.
J**Y
Good relay for cheap
Nice relay for snow plow and cheap. Is holding up nice for about 25 driveways now.
C**R
Short use and fear of fire
I purchased this product because I needed a continuous duty solenoid to keep two 12v batteries wired in parallel charged while driving the vehicle but not engaged while the engine is off, so my engine battery would not lose its charge because of the two house batteries draining it without my knowledge. It took some time to install the system and get my Chevy cargo van ready for some distance camping. But even before I left town, I discovered that the solenoid was getting hotter than I could even touch and my automatic breaker kept cycling. The odd thing was that I didn't have my inverter turned on nor any of my inside lighting (which wouldn't have been much). The only thing that was going on was the solenoid providing power from the alternator to keep the two house batteries charged. Nothing on the device indicates it's a continuous duty device and nothing on the device indicates the rated amperage. I'm quite disappointed that the device I purchased didn't even last for a single camping trip but gave me enough unrest, over perhaps suddenly bursting into flames, that I disconnected the device. And since I purchased the device June of 2019 and it's now August of 2020, I can't even return it for a refund. So, it's a total bust and I would caution other buyers to be aware and make certain you thoroughly check it out before getting into a desolate area and finding that it's just not what it should be.
K**N
Stupid dues paid for this replacement
Bought this replacement for a perfectly good one that I had on my JCB for years, one that I ruined by being stupid. The new one is a heavy duty one 200amp that is exact replacement that got here super quick. If it works like the one I stupidwrecked I will be most happy.
L**T
Great Service
Great Product & Great Service
J**S
Works perfect not exact fit for omc oem solenoid have to drill new mounting holes
T**M
Work as they should. Wired up a pair to repair failed solenoids on my older 3 wire motor RV slide control system. Nice that control grounds through body so no additional ground wire needed.
S**R
Ok.. not best quality. Get what you pay for. Like color
N**Y
Works well and as expected
V**R
My Yanmar 40hp inboard diesel was giving me starter fits. After replacing the starter and solenoid, still did not work - just "click". Then I removed the starter relay and discovered it was rusted out. Vancouver Outboard quoted a new starter relay switch at close to $400 and rush shipping charges. I paid $30 for this part and it can handle 200 amps. Works like a top so far.
Trustpilot
2 days ago
3 days ago