  The Supersymmetric Custodial Triplet Model (SCTM) adds to the particle
content of the MSSM three $SU(2)_L$ triplet chiral superfields with hypercharge
$Y=(0,\pm1)$. At the superpotential level the model respects a global $SU(2)_L
\otimes SU(2)_R$ symmetry only broken by the Yukawa interactions. The pattern
of vacuum expectation values of the neutral doublet and triplet scalar fields
depends on the symmetry pattern of the Higgs soft breaking masses. We study the
cases where this symmetry is maintained in the Higgs sector, and when it is
broken only by the two doublets attaining different vacuum expectation values.
In the former case, the symmetry is spontaneously broken down to the vectorial
subgroup $SU(2)_V$ and the $\rho$ parameter is protected by the custodial
symmetry. However in both situations the $\rho$ parameter is protected at tree
level, allowing for light triplet scalars with large vacuum expectation values.
We find that over a large range of parameter space, a light neutralino can
supply the correct relic abundance of dark matter either through resonant
s-channel triplet scalar funnels or well tempering of the Bino with the triplet
fermions. Direct detection experiments have trouble probing these model points
because the custodial symmetry suppresses the coupling of the neutralino and
the $Z$ and a small Higgsino component of the neutralino suppresses the
coupling with the Higgs. Likewise the annihilation cross sections for indirect
detection lie below the Fermi-LAT upper bounds for the different channels.
