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You can have different breaker values. The trick is to separate the UV relay definition from the OV by using more than one relay record. The example below is for a VRT relay schema.
/MINS model M M+1 M+2 VL VU TP TB /
1 'VTGTPAT' XXXX xxx xx -1 1.3 0.034 0.1 /
2 'VTGTPAT' XXXX xxx xx -1 1.2 0.5 0.1 /
3 'VTGTPAT' XXXX xxx xx -1 1.1 5 0.1 /
4 'VTGTPAT' XXXX xxx xx 0.1 5 0.15 0.12 /
5 'VTGTPAT' XXXX xxx xx 0.9 5 3 0.12 /