Being placed on suspension is not an automatic assumption of guilt and does not amount to disciplinary action. Whilst it can lead to disciplinary action, it is primarily there to be used as a precautionary measure whilst an employer investigates any serious allegations against the employee. Reasons for suspending could be in the case of gross misconduct, breakdown of relationship, risk to an employer's property, their clients or other employees, to preserve evidence or ensure it is not tampered with, avoid potential witnesses being pressured or intimidated, etc.
The period of suspension should be as short as possible and kept under regular review. During that period the employer should conduct a reasonable investigation into the allegations against the employee. If the investigation gathers enough evidence to justify taking disciplinary action, the employee has the right to be informed in advance of the allegations and evidence to be used against them and be given the opportunity to prepare to defend themselves at the forthcoming hearing.
On the other hand, if the investigation does not find enough evidence to justify a disciplinary, the employer should terminate the suspension immediately and allow the employee to return to work as normal.
Saying that, if a person is suspended unfairly, especially for a prolonged period of time, or as a knee-jerk reaction, there are examples when this has resulted in a breach of trust and confidence. In turn, this can allow the employee to consider treating themselves as being constructively dismissed and leaving the employer, pursuing them for compensation.
It is worth mentioning that there is a possible alternative solution, where the employer is approached on a 'without prejudice' basis (i.e. off the record) to try and discuss the possibility of leaving under a settlement agreement. Under such an agreement, the employee gets compensated for leaving the company with no fuss and in return promises not to make any claims against the employer in the future. It is essentially a clean break, where both parties move on without the need for going to tribunal. However, it is an entirely voluntary process and the employer does not have to participate in such negotiations or agree to anything. It just means that these discussions cannot be brought up in any subsequent tribunal claim and prejudice either party. So there is nothing to lose by raising this possibility with them as the worst outcome is they say no, whereas if successful it can mean being allowed to leave in accordance with any pre-agreed terms, such as with compensation and an agreed reference.
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