Does this relay incorporate an over-voltage suppression diode ?

Sorry, I don’t know, but it works well on 12 volts.

Would this work in a 2011 Harley sportster xl custom?

Hi, yes it is a 12 volt relay and should work well.

It is somewhat unclear, is this a normally close relay?

This relay is a changeover relay and can be used as both normally open (no), and normally closed (nc) depending on how you connect it up. However being used as a normally closed relay will result in a reduction in current switching ability depending on what sort of load is being switched

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Description

⚡ Drive your circuits with Bosch’s mini relay power — small size, massive impact!

UNMATCHED DURABILITY - Engineered for up to 250,000 reliable switching cycles, ensuring long-lasting performance.
PLUG PLAY SIMPLICITY - Standardized 5-pin connectors make installation quick and hassle-free—get back on the road faster.
POWERHOUSE PERFORMANCE - Handles up to 30A for demanding automotive circuits without breaking a sweat.
WEATHERPROOF CONFIDENCE - IP5K4 rated housing protects against dust and water spray, perfect for rugged vehicle environments.
EXTREME TEMPERATURE RESILIENCE - Operates flawlessly from freezing -40°C to scorching 100°C—built for every climate challenge.

The Bosch 0332209150 Mini Relay is a robust 12V, 30A automotive relay designed for high switching capacity and extreme temperature endurance (-40°C to 100°C). Featuring standardized 5-pin connectors and an IP5K4 rated housing, it guarantees quick installation and reliable protection against harsh conditions. With up to 250,000 switching cycles, this compact relay is engineered for durability and consistent performance across a wide range of vehicle applications.

Specifications

Manufacturer	Bosch
Brand	Bosch Automotive
Model	5 Pins, 12 V, 20/30 A, Bosch 0332209150 Changeover Mini Relays
Product Dimensions	4 x 4 x 6 cm; 30 g
Item model number	0332209150
Manufacturer part number	0332209150
OEM Part Number	AUDI 443951254A, CATERPILLAR 8C8019, CHRYSLER 048640022A, CHRYSLER 48640022A, DAF 0906185, DAF 1279539, DAF 1778563, DAIMLER LTD. A0018354106, FIAT 60501035, FORD 06053460, FORD 1519814, FORD 1574754, FORD 71BG10B926AA, HELLA 4RD003520081, HELLA 4RD003520082, HELLA 4RD003520088, HELLA 4RD003520131, HELLA 4RD007794021, HELLA 4RD933332041, HELLA 4RD933332047, IVECO 1164017, IVECO 5155318, IVECO 8109522, JOHN DEERE AL29657, MAN 81259020056, MAN 81259020111, MAN 81259020238, MERCEDES-BENZ 0005458305, MERCEDES-BENZ 0018354106, MERCEDES-BENZ 5455505, MERCEDES-BENZ A0005458305, MERCEDES-BENZ A0018354106, PORSCHE 91179961356, VOLVO 1214764, VOLVO 20043732011, VOLVO 872300, VW (VOLKSWAGEN) 443951254A,
Lift type	Automatic
Wattage	3.6E+2
Item Weight	30 g

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