Robot arm simulators are systems that raise a lot of interest and motivation from students but safeguard their physical integrity as well as the equipments'. Telerobotics represents the control/operation of a robot arm from a distance while it performs highly risky manipulations (either with radioactive, explosive or other dangerous objects), for instance. For some telerobotic tasks, two or more operators need to work together depending on the complexity of the task or the complexity of the object being manipulated. A collaborative telerobotic simulator should offer an environment for executing robotic tasks that are divided in such a way that require operators mutual understanding and complementary work. This paper presents a telerobotic 3D simulator for collaborative robotic tasks, called CollBot4us (that comes from “COLLaborative roBOT FOR US”), which allows each operator to visualize the same 3D environment but from their own perspective and operating from different places (connected via network). CollBot4us is intended to be used for telerobotic tasks training as well as for collaboration strategies development.