Moslem demonstrators declaring their solidarity with Iran converged on U.S. diplomatic installations in Kuwait, Manila and Calcutta yesterday, the Islamic sabbath and also a major holy day for Shiite Moslems. y

In addition, two explosions rocked the American Embassy compound in Bangkok and Soviet authorities appeared to have thwarted a demonstration by Iranian and Arab students at the American mission in Moscow.

Yesterday's developments came nine days after the U.S. Embassy in Islamabad, Pakistan, was sacked by an enraged Moslem mob, and four days after the United States decided to withdraw nonessential diplomatic personnel and dependents from American missions in 11 Moslem countries.

The American action was taken in the face of the worsening Iranian crisis and amid continuing call by that country's Shiite leadership for attacks on American interests.

In Kuwait, on the Persian Gulf, a crowd of Kuwaitis and Iranians estimated at several thousand marched on the U.S. Embassy and was driven off by Kuwaiti security personnel, who used tear gas as the crowd drew to within about 300 yards of the compound.

Reuter quoted witnesses who said the protesters gathered after Friday prayers and headed for the embassy, shouting slogans supporting Iranian revolutionary leader Ayatollah Rhuhollah Khomeini.

The State Department in Washington confirmed yesterday that all at the embassy were safe and that the United States had thanked the Kuwaiti government for its "quick and efficient response" to the demonstration.

Kuwait earlier in the week had objected to Washington's withdrawal of diplomatic personnel, saying it was neither justified nor warranted.

In Manila, the Philippine capital, riot police broke up a demonstration by about 250 Moslem students who had gathered in a park students about a half-mile from the U.S. Embassy as they began to move toward the American mission chanting slogans, including "Return Satan Shah" and "Down With Carter Peanut Politics."

Inside the embassy compound in the Thai capital, two dusk explosion broke the retraining wall of a fish pond but caused no injuries.

Thai police responded immediately and Thai Prime Minister Kriangsak Chomanan promised an investigation into the blasts, which he suggested in a statement might have been the work of a Thai Moslem separatist group.

The Moscow incident, on which State Department sources refused comment, apparently began according to news service reports quoting official U.S. sources, when the American embassy there was warned that a demonstration by Iranian and Arab students might take place. Later yesterday, after extra police had been sent to guard the compound, a second call indicated that a march was unlikely.

There are large numbers of Islamic students in Moscow, but any demonstration without official sanction would have been unlikely.

In Calcutta, the scene of an anti-American demonstration two weeks ago, some 50 Iranian students burned an effigy of President Carter in front of the U.S. consulate Police dispersed the students yesterday as they did in the previous incident. Aside from the two Calcutta incidents, India's has been relatively free of expression of anti-American sentiment.

India yesterday joined the ranks of countries protesting the seizure of the American Embassy in Tehran and the holding of 50 hostages as a violation of international law.