Robertshaw MSA312 simmerstat. Fitted to a wide range of European hobs and ranges - Blanco, Omega, Baumatic, Smeg. If your hob element won't simmer (runs too hot) this is the part to replace.

• Rated 15 amps
• 2 pole 
• 6mm metal shaft - replaces earlier plastic shaft version prone to breakage (image is generic)
• Alternate part numbers MSA-V01, REG30001, OG1206