You can insure yourself for up to S$400,000 per insurer, with a cap of S$200,000 for whole life DPI.
The following are some scenarios to illustrate how the cap of S$400,000 for DPI and sub-limit of S$200,000 for whole life DPI work.
Scenario 1:
If you have bought a term life DPI with sum insured of S$300,000, you may buy an additional term life DPI or whole life DPI with sum insured of $100,000 from the same insurer.
Scenario 2:
If you have bought a whole life DPI with sum insured of S$150,000 from an insurer, you may buy another whole life DPI with sum insured not exceeding S$50,000, or a term life DPI with sum insured not exceeding S$250,000 from the same insurer.
The scenarios above are not exhaustive. Visit
https://www.moneysense.gov.sg/articles/2018/10/buying-direct-purchase-insurance for more examples on the amount of DPI you can buy.